drivers/scsi/ibmmca.c

   1 /*
   2  Low Level Linux Driver for the IBM Microchannel SCSI Subsystem for
   3  Linux Kernel >= 2.4.0.
   4  Copyright (c) 1995 Strom Systems, Inc. under the terms of the GNU
   5  General Public License. Written by Martin Kolinek, December 1995.
   6  Further development by: Chris Beauregard, Klaus Kudielka, Michael Lang
   7  See the file Documentation/scsi/ibmmca.txt for a detailed description
   8  of this driver, the commandline arguments and the history of its
   9  development.
  10  See the WWW-page: http://www.uni-mainz.de/~langm000/linux.html for latest
  11  updates, info and ADF-files for adapters supported by this driver.
  12
  13  Alan Cox <alan@redhat.com>
  14  Updated for Linux 2.5.45 to use the new error handler, cleaned up the
  15  lock macros and did a few unavoidable locking tweaks, plus one locking
  16  fix in the irq and completion path.
  17
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/ctype.h>
  24 #include <linux/string.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/ioport.h>
  27 #include <linux/delay.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/stat.h>
  31 #include <linux/mca.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/init.h>
  34 #include <linux/mca-legacy.h>
  35
  36 #include <asm/system.h>
  37 #include <asm/io.h>
  38
  39 #include "scsi.h"
  40 #include <scsi/scsi_host.h>
  41 #include "ibmmca.h"
  42
  43 /* current version of this driver-source: */
  44 #define IBMMCA_SCSI_DRIVER_VERSION "4.0b-ac"
  45
  46 /* driver configuration */
  47 #define IM_MAX_HOSTS     8      /* maximum number of host adapters */
  48 #define IM_RESET_DELAY  60      /* seconds allowed for a reset */
  49
  50 /* driver debugging - #undef all for normal operation */
  51 /* if defined: count interrupts and ignore this special one: */
  52 #undef  IM_DEBUG_TIMEOUT        //50
  53 #define TIMEOUT_PUN     0
  54 #define TIMEOUT_LUN     0
  55 /* verbose interrupt: */
  56 #undef IM_DEBUG_INT
  57 /* verbose queuecommand: */
  58 #undef IM_DEBUG_CMD
  59 /* verbose queucommand for specific SCSI-device type: */
  60 #undef IM_DEBUG_CMD_SPEC_DEV
  61 /* verbose device probing */
  62 #undef IM_DEBUG_PROBE
  63
  64 /* device type that shall be displayed on syslog (only during debugging): */
  65 #define IM_DEBUG_CMD_DEVICE     TYPE_TAPE
  66
  67 /* relative addresses of hardware registers on a subsystem */
  68 #define IM_CMD_REG(hi)  (hosts[(hi)]->io_port)  /*Command Interface, (4 bytes long) */
  69 #define IM_ATTN_REG(hi) (hosts[(hi)]->io_port+4)        /*Attention (1 byte) */
  70 #define IM_CTR_REG(hi)  (hosts[(hi)]->io_port+5)        /*Basic Control (1 byte) */
  71 #define IM_INTR_REG(hi) (hosts[(hi)]->io_port+6)        /*Interrupt Status (1 byte, r/o) */
  72 #define IM_STAT_REG(hi) (hosts[(hi)]->io_port+7)        /*Basic Status (1 byte, read only) */
  73
  74 /* basic I/O-port of first adapter */
  75 #define IM_IO_PORT      0x3540
  76 /* maximum number of hosts that can be found */
  77 #define IM_N_IO_PORT    8
  78
  79 /*requests going into the upper nibble of the Attention register */
  80 /*note: the lower nibble specifies the device(0-14), or subsystem(15) */
  81 #define IM_IMM_CMD      0x10    /*immediate command */
  82 #define IM_SCB          0x30    /*Subsystem Control Block command */
  83 #define IM_LONG_SCB     0x40    /*long Subsystem Control Block command */
  84 #define IM_EOI          0xe0    /*end-of-interrupt request */
  85
  86 /*values for bits 7,1,0 of Basic Control reg. (bits 6-2 reserved) */
  87 #define IM_HW_RESET     0x80    /*hardware reset */
  88 #define IM_ENABLE_DMA   0x02    /*enable subsystem's busmaster DMA */
  89 #define IM_ENABLE_INTR  0x01    /*enable interrupts to the system */
  90
  91 /*to interpret the upper nibble of Interrupt Status register */
  92 /*note: the lower nibble specifies the device(0-14), or subsystem(15) */
  93 #define IM_SCB_CMD_COMPLETED                    0x10
  94 #define IM_SCB_CMD_COMPLETED_WITH_RETRIES       0x50
  95 #define IM_LOOP_SCATTER_BUFFER_FULL             0x60
  96 #define IM_ADAPTER_HW_FAILURE                   0x70
  97 #define IM_IMMEDIATE_CMD_COMPLETED              0xa0
  98 #define IM_CMD_COMPLETED_WITH_FAILURE           0xc0
  99 #define IM_CMD_ERROR                            0xe0
 100 #define IM_SOFTWARE_SEQUENCING_ERROR            0xf0
 101
 102 /*to interpret bits 3-0 of Basic Status register (bits 7-4 reserved) */
 103 #define IM_CMD_REG_FULL         0x08
 104 #define IM_CMD_REG_EMPTY        0x04
 105 #define IM_INTR_REQUEST         0x02
 106 #define IM_BUSY                 0x01
 107
 108 /*immediate commands (word written into low 2 bytes of command reg) */
 109 #define IM_RESET_IMM_CMD        0x0400
 110 #define IM_FEATURE_CTR_IMM_CMD  0x040c
 111 #define IM_DMA_PACING_IMM_CMD   0x040d
 112 #define IM_ASSIGN_IMM_CMD       0x040e
 113 #define IM_ABORT_IMM_CMD        0x040f
 114 #define IM_FORMAT_PREP_IMM_CMD  0x0417
 115
 116 /*SCB (Subsystem Control Block) structure */
 117 struct im_scb {
 118         unsigned short command; /*command word (read, etc.) */
 119         unsigned short enable;  /*enable word, modifies cmd */
 120         union {
 121                 unsigned long log_blk_adr;      /*block address on SCSI device */
 122                 unsigned char scsi_cmd_length;  /*6,10,12, for other scsi cmd */
 123         } u1;
 124         unsigned long sys_buf_adr;      /*physical system memory adr */
 125         unsigned long sys_buf_length;   /*size of sys mem buffer */
 126         unsigned long tsb_adr;  /*Termination Status Block adr */
 127         unsigned long scb_chain_adr;    /*optional SCB chain address */
 128         union {
 129                 struct {
 130                         unsigned short count;   /*block count, on SCSI device */
 131                         unsigned short length;  /*block length, on SCSI device */
 132                 } blk;
 133                 unsigned char scsi_command[12]; /*other scsi command */
 134         } u2;
 135 };
 136
 137 /*structure scatter-gather element (for list of system memory areas) */
 138 struct im_sge {
 139         void *address;
 140         unsigned long byte_length;
 141 };
 142
 143 /*structure returned by a get_pos_info command: */
 144 struct im_pos_info {
 145         unsigned short pos_id;  /* adapter id */
 146         unsigned char pos_3a;   /* pos 3 (if pos 6 = 0) */
 147         unsigned char pos_2;    /* pos 2 */
 148         unsigned char int_level;        /* interrupt level IRQ 11 or 14 */
 149         unsigned char pos_4a;   /* pos 4 (if pos 6 = 0) */
 150         unsigned short connector_size;  /* MCA connector size: 16 or 32 Bit */
 151         unsigned char num_luns; /* number of supported luns per device */
 152         unsigned char num_puns; /* number of supported puns */
 153         unsigned char pacing_factor;    /* pacing factor */
 154         unsigned char num_ldns; /* number of ldns available */
 155         unsigned char eoi_off;  /* time EOI and interrupt inactive */
 156         unsigned char max_busy; /* time between reset and busy on */
 157         unsigned short cache_stat;      /* ldn cachestat. Bit=1 = not cached */
 158         unsigned short retry_stat;      /* retry status of ldns. Bit=1=disabled */
 159         unsigned char pos_4b;   /* pos 4 (if pos 6 = 1) */
 160         unsigned char pos_3b;   /* pos 3 (if pos 6 = 1) */
 161         unsigned char pos_6;    /* pos 6 */
 162         unsigned char pos_5;    /* pos 5 */
 163         unsigned short max_overlap;     /* maximum overlapping requests */
 164         unsigned short num_bus; /* number of SCSI-busses */
 165 };
 166
 167 /*values for SCB command word */
 168 #define IM_NO_SYNCHRONOUS      0x0040   /*flag for any command */
 169 #define IM_NO_DISCONNECT       0x0080   /*flag for any command */
 170 #define IM_READ_DATA_CMD       0x1c01
 171 #define IM_WRITE_DATA_CMD      0x1c02
 172 #define IM_READ_VERIFY_CMD     0x1c03
 173 #define IM_WRITE_VERIFY_CMD    0x1c04
 174 #define IM_REQUEST_SENSE_CMD   0x1c08
 175 #define IM_READ_CAPACITY_CMD   0x1c09
 176 #define IM_DEVICE_INQUIRY_CMD  0x1c0b
 177 #define IM_READ_LOGICAL_CMD    0x1c2a
 178 #define IM_OTHER_SCSI_CMD_CMD  0x241f
 179
 180 /* unused, but supported, SCB commands */
 181 #define IM_GET_COMMAND_COMPLETE_STATUS_CMD   0x1c07     /* command status */
 182 #define IM_GET_POS_INFO_CMD                  0x1c0a     /* returns neat stuff */
 183 #define IM_READ_PREFETCH_CMD                 0x1c31     /* caching controller only */
 184 #define IM_FOMAT_UNIT_CMD                    0x1c16     /* format unit */
 185 #define IM_REASSIGN_BLOCK_CMD                0x1c18     /* in case of error */
 186
 187 /*values to set bits in the enable word of SCB */
 188 #define IM_READ_CONTROL              0x8000
 189 #define IM_REPORT_TSB_ONLY_ON_ERROR  0x4000
 190 #define IM_RETRY_ENABLE              0x2000
 191 #define IM_POINTER_TO_LIST           0x1000
 192 #define IM_SUPRESS_EXCEPTION_SHORT   0x0400
 193 #define IM_BYPASS_BUFFER             0x0200
 194 #define IM_CHAIN_ON_NO_ERROR         0x0001
 195
 196 /*TSB (Termination Status Block) structure */
 197 struct im_tsb {
 198         unsigned short end_status;
 199         unsigned short reserved1;
 200         unsigned long residual_byte_count;
 201         unsigned long sg_list_element_adr;
 202         unsigned short status_length;
 203         unsigned char dev_status;
 204         unsigned char cmd_status;
 205         unsigned char dev_error;
 206         unsigned char cmd_error;
 207         unsigned short reserved2;
 208         unsigned short reserved3;
 209         unsigned short low_of_last_scb_adr;
 210         unsigned short high_of_last_scb_adr;
 211 };
 212
 213 /*subsystem uses interrupt request level 14 */
 214 #define IM_IRQ     14
 215 /*SCSI-2 F/W may evade to interrupt 11 */
 216 #define IM_IRQ_FW  11
 217
 218 /* Model 95 has an additional alphanumeric display, which can be used
 219    to display SCSI-activities. 8595 models do not have any disk led, which
 220    makes this feature quite useful.
 221    The regular PS/2 disk led is turned on/off by bits 6,7 of system
 222    control port. */
 223
 224 /* LED display-port (actually, last LED on display) */
 225 #define MOD95_LED_PORT     0x108
 226 /* system-control-register of PS/2s with diskindicator */
 227 #define PS2_SYS_CTR        0x92
 228 /* activity displaying methods */
 229 #define LED_DISP           1
 230 #define LED_ADISP          2
 231 #define LED_ACTIVITY       4
 232 /* failed intr */
 233 #define CMD_FAIL           255
 234
 235 /* The SCSI-ID(!) of the accessed SCSI-device is shown on PS/2-95 machines' LED
 236    displays. ldn is no longer displayed here, because the ldn mapping is now
 237    done dynamically and the ldn <-> pun,lun maps can be looked-up at boottime
 238    or during uptime in /proc/scsi/ibmmca/<host_no> in case of trouble,
 239    interest, debugging or just for having fun. The left number gives the
 240    host-adapter number and the right shows the accessed SCSI-ID. */
 241
 242 /* display_mode is set by the ibmmcascsi= command line arg */
 243 static int display_mode = 0;
 244 /* set default adapter timeout */
 245 static unsigned int adapter_timeout = 45;
 246 /* for probing on feature-command: */
 247 static unsigned int global_command_error_excuse = 0;
 248 /* global setting by command line for adapter_speed */
 249 static int global_adapter_speed = 0;    /* full speed by default */
 250
 251 /* Panel / LED on, do it right for F/W addressin, too. adisplay will
 252  * just ignore ids>7, as the panel has only 7 digits available */
 253 #define PS2_DISK_LED_ON(ad,id) { if (display_mode & LED_DISP) { if (id>9) \
 254     outw((ad+48)|((id+55)<<8), MOD95_LED_PORT ); else \
 255     outw((ad+48)|((id+48)<<8), MOD95_LED_PORT ); } else \
 256     if (display_mode & LED_ADISP) { if (id<7) outb((char)(id+48),MOD95_LED_PORT+1+id); \
 257     outb((char)(ad+48), MOD95_LED_PORT); } \
 258     if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
 259     outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR); }
 260
 261 /* Panel / LED off */
 262 /* bug fixed, Dec 15, 1997, where | was replaced by & here */
 263 #define PS2_DISK_LED_OFF() { if (display_mode & LED_DISP) \
 264     outw(0x2020, MOD95_LED_PORT ); else if (display_mode & LED_ADISP) { \
 265     outl(0x20202020,MOD95_LED_PORT); outl(0x20202020,MOD95_LED_PORT+4); } \
 266     if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
 267     outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR); }
 268
 269 /*list of supported subsystems */
 270 struct subsys_list_struct {
 271         unsigned short mca_id;
 272         char *description;
 273 };
 274
 275 /* types of different supported hardware that goes to hostdata special */
 276 #define IBM_SCSI2_FW     0
 277 #define IBM_7568_WCACHE  1
 278 #define IBM_EXP_UNIT     2
 279 #define IBM_SCSI_WCACHE  3
 280 #define IBM_SCSI         4
 281
 282 /* other special flags for hostdata structure */
 283 #define FORCED_DETECTION         100
 284 #define INTEGRATED_SCSI          101
 285
 286 /* List of possible IBM-SCSI-adapters */
 287 static struct subsys_list_struct subsys_list[] = {
 288         {0x8efc, "IBM SCSI-2 F/W Adapter"},     /* special = 0 */
 289         {0x8efd, "IBM 7568 Industrial Computer SCSI Adapter w/Cache"},  /* special = 1 */
 290         {0x8ef8, "IBM Expansion Unit SCSI Controller"}, /* special = 2 */
 291         {0x8eff, "IBM SCSI Adapter w/Cache"},   /* special = 3 */
 292         {0x8efe, "IBM SCSI Adapter"},   /* special = 4 */
 293 };
 294
 295 /* Max number of logical devices (can be up from 0 to 14).  15 is the address
 296 of the adapter itself. */
 297 #define MAX_LOG_DEV  15
 298
 299 /*local data for a logical device */
 300 struct logical_device {
 301         struct im_scb scb;      /* SCSI-subsystem-control-block structure */
 302         struct im_tsb tsb;      /* SCSI command complete status block structure */
 303         struct im_sge sge[16];  /* scatter gather list structure */
 304         unsigned char buf[256]; /* SCSI command return data buffer */
 305         Scsi_Cmnd *cmd;         /* SCSI-command that is currently in progress */
 306         int device_type;        /* type of the SCSI-device. See include/scsi/scsi.h
 307                                    for interpretation of the possible values */
 308         int block_length;       /* blocksize of a particular logical SCSI-device */
 309         int cache_flag;         /* 1 if this is uncached, 0 if cache is present for ldn */
 310         int retry_flag;         /* 1 if adapter retry is disabled, 0 if enabled */
 311 };
 312
 313 /* statistics of the driver during operations (for proc_info) */
 314 struct Driver_Statistics {
 315         /* SCSI statistics on the adapter */
 316         int ldn_access[MAX_LOG_DEV + 1];        /* total accesses on a ldn */
 317         int ldn_read_access[MAX_LOG_DEV + 1];   /* total read-access on a ldn */
 318         int ldn_write_access[MAX_LOG_DEV + 1];  /* total write-access on a ldn */
 319         int ldn_inquiry_access[MAX_LOG_DEV + 1];        /* total inquiries on a ldn */
 320         int ldn_modeselect_access[MAX_LOG_DEV + 1];     /* total mode selects on ldn */
 321         int scbs;               /* short SCBs queued */
 322         int long_scbs;          /* long SCBs queued */
 323         int total_accesses;     /* total accesses on all ldns */
 324         int total_interrupts;   /* total interrupts (should be
 325                                    same as total_accesses) */
 326         int total_errors;       /* command completed with error */
 327         /* dynamical assignment statistics */
 328         int total_scsi_devices; /* number of physical pun,lun */
 329         int dyn_flag;           /* flag showing dynamical mode */
 330         int dynamical_assignments;      /* number of remappings of ldns */
 331         int ldn_assignments[MAX_LOG_DEV + 1];   /* number of remappings of each
 332                                                    ldn */
 333 };
 334
 335 /* data structure for each host adapter */
 336 struct ibmmca_hostdata {
 337         /* array of logical devices: */
 338         struct logical_device _ld[MAX_LOG_DEV + 1];
 339         /* array to convert (pun, lun) into logical device number: */
 340         unsigned char _get_ldn[16][8];
 341         /*array that contains the information about the physical SCSI-devices
 342            attached to this host adapter: */
 343         unsigned char _get_scsi[16][8];
 344         /* used only when checking logical devices: */
 345         int _local_checking_phase_flag;
 346         /* report received interrupt: */
 347         int _got_interrupt;
 348         /* report termination-status of SCSI-command: */
 349         int _stat_result;
 350         /* reset status (used only when doing reset): */
 351         int _reset_status;
 352         /* code of the last SCSI command (needed for panic info): */
 353         int _last_scsi_command[MAX_LOG_DEV + 1];
 354         /* identifier of the last SCSI-command type */
 355         int _last_scsi_type[MAX_LOG_DEV + 1];
 356         /* last blockcount */
 357         int _last_scsi_blockcount[MAX_LOG_DEV + 1];
 358         /* last locgical block address */
 359         unsigned long _last_scsi_logical_block[MAX_LOG_DEV + 1];
 360         /* Counter that points on the next reassignable ldn for dynamical
 361            remapping. The default value is 7, that is the first reassignable
 362            number in the list at boottime: */
 363         int _next_ldn;
 364         /* Statistics-structure for this IBM-SCSI-host: */
 365         struct Driver_Statistics _IBM_DS;
 366         /* This hostadapters pos-registers pos2 until pos6 */
 367         unsigned int _pos[8];
 368         /* assign a special variable, that contains dedicated info about the
 369            adaptertype */
 370         int _special;
 371         /* connector size on the MCA bus */
 372         int _connector_size;
 373         /* synchronous SCSI transfer rate bitpattern */
 374         int _adapter_speed;
 375 };
 376
 377 /* macros to access host data structure */
 378 #define subsystem_pun(hi) (hosts[(hi)]->this_id)
 379 #define subsystem_maxid(hi) (hosts[(hi)]->max_id)
 380 #define ld(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_ld)
 381 #define get_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_ldn)
 382 #define get_scsi(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_scsi)
 383 #define local_checking_phase_flag(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_local_checking_phase_flag)
 384 #define got_interrupt(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_got_interrupt)
 385 #define stat_result(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_stat_result)
 386 #define reset_status(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_reset_status)
 387 #define last_scsi_command(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_command)
 388 #define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
 389 #define last_scsi_blockcount(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_blockcount)
 390 #define last_scsi_logical_block(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_logical_block)
 391 #define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
 392 #define next_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_next_ldn)
 393 #define IBM_DS(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_IBM_DS)
 394 #define special(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_special)
 395 #define subsystem_connector_size(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_connector_size)
 396 #define adapter_speed(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_adapter_speed)
 397 #define pos2(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[2])
 398 #define pos3(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[3])
 399 #define pos4(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[4])
 400 #define pos5(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[5])
 401 #define pos6(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[6])
 402
 403 /* Define a arbitrary number as subsystem-marker-type. This number is, as
 404    described in the ANSI-SCSI-standard, not occupied by other device-types. */
 405 #define TYPE_IBM_SCSI_ADAPTER   0x2F
 406
 407 /* Define 0xFF for no device type, because this type is not defined within
 408    the ANSI-SCSI-standard, therefore, it can be used and should not cause any
 409    harm. */
 410 #define TYPE_NO_DEVICE          0xFF
 411
 412 /* define medium-changer. If this is not defined previously, e.g. Linux
 413    2.0.x, define this type here. */
 414 #ifndef TYPE_MEDIUM_CHANGER
 415 #define TYPE_MEDIUM_CHANGER     0x08
 416 #endif
 417
 418 /* define possible operations for the immediate_assign command */
 419 #define SET_LDN        0
 420 #define REMOVE_LDN     1
 421
 422 /* ldn which is used to probe the SCSI devices */
 423 #define PROBE_LDN      0
 424
 425 /* reset status flag contents */
 426 #define IM_RESET_NOT_IN_PROGRESS         0
 427 #define IM_RESET_IN_PROGRESS             1
 428 #define IM_RESET_FINISHED_OK             2
 429 #define IM_RESET_FINISHED_FAIL           3
 430 #define IM_RESET_NOT_IN_PROGRESS_NO_INT  4
 431 #define IM_RESET_FINISHED_OK_NO_INT      5
 432
 433 /* define undefined SCSI-command */
 434 #define NO_SCSI                  0xffff
 435
 436 /*-----------------------------------------------------------------------*/
 437
 438 /* if this is nonzero, ibmmcascsi option has been passed to the kernel */
 439 static int io_port[IM_MAX_HOSTS] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 440 static int scsi_id[IM_MAX_HOSTS] = { 7, 7, 7, 7, 7, 7, 7, 7 };
 441
 442 /* fill module-parameters only, when this define is present.
 443    (that is kernel version 2.1.x) */
 444 #if defined(MODULE)
 445 static char *boot_options = NULL;
 446 module_param(boot_options, charp, 0);
 447 module_param_array(io_port, int, NULL, 0);
 448 module_param_array(scsi_id, int, NULL, 0);
 449
 450 #if 0 /* FIXME: No longer exist? --RR */
 451 MODULE_PARM(display, "1i");
 452 MODULE_PARM(adisplay, "1i");
 453 MODULE_PARM(normal, "1i");
 454 MODULE_PARM(ansi, "1i");
 455 #endif
 456
 457 MODULE_LICENSE("GPL");
 458 #endif
 459 /*counter of concurrent disk read/writes, to turn on/off disk led */
 460 static int disk_rw_in_progress = 0;
 461
 462 /* host information */
 463 static int found = 0;
 464 static struct Scsi_Host *hosts[IM_MAX_HOSTS + 1] = {
 465         NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
 466 };
 467 static unsigned int pos[8];     /* whole pos register-line for diagnosis */
 468 /* Taking into account the additions, made by ZP Gu.
 469  * This selects now the preset value from the configfile and
 470  * offers the 'normal' commandline option to be accepted */
 471 #ifdef CONFIG_IBMMCA_SCSI_ORDER_STANDARD
 472 static char ibm_ansi_order = 1;
 473 #else
 474 static char ibm_ansi_order = 0;
 475 #endif
 476
 477 static void issue_cmd(int, unsigned long, unsigned char);
 478 static void internal_done(Scsi_Cmnd * cmd);
 479 static void check_devices(int, int);
 480 static int immediate_assign(int, unsigned int, unsigned int, unsigned int, unsigned int);
 481 static int immediate_feature(int, unsigned int, unsigned int);
 482 #ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
 483 static int immediate_reset(int, unsigned int);
 484 #endif
 485 static int device_inquiry(int, int);
 486 static int read_capacity(int, int);
 487 static int get_pos_info(int);
 488 static char *ti_p(int);
 489 static char *ti_l(int);
 490 static char *ibmrate(unsigned int, int);
 491 static int probe_display(int);
 492 static int probe_bus_mode(int);
 493 static int device_exists(int, int, int *, int *);
 494 static struct Scsi_Host *ibmmca_register(struct scsi_host_template *, int, int, int, char *);
 495 static int option_setup(char *);
 496 /* local functions needed for proc_info */
 497 static int ldn_access_load(int, int);
 498 static int ldn_access_total_read_write(int);
 499
 500 static irqreturn_t interrupt_handler(int irq, void *dev_id,
 501                                         struct pt_regs *regs)
 502 {
 503         int host_index, ihost_index;
 504         unsigned int intr_reg;
 505         unsigned int cmd_result;
 506         unsigned int ldn;
 507         Scsi_Cmnd *cmd;
 508         int lastSCSI;
 509         struct Scsi_Host *dev = dev_id;
 510
 511         spin_lock(dev->host_lock);
 512             /* search for one adapter-response on shared interrupt */
 513             for (host_index = 0; hosts[host_index] && !(inb(IM_STAT_REG(host_index)) & IM_INTR_REQUEST); host_index++);
 514         /* return if some other device on this IRQ caused the interrupt */
 515         if (!hosts[host_index]) {
 516                 spin_unlock(dev->host_lock);
 517                 return IRQ_NONE;
 518         }
 519
 520         /* the reset-function already did all the job, even ints got
 521            renabled on the subsystem, so just return */
 522         if ((reset_status(host_index) == IM_RESET_NOT_IN_PROGRESS_NO_INT) || (reset_status(host_index) == IM_RESET_FINISHED_OK_NO_INT)) {
 523                 reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS;
 524                 spin_unlock(dev->host_lock);
 525                 return IRQ_HANDLED;
 526         }
 527
 528         /*must wait for attention reg not busy, then send EOI to subsystem */
 529         while (1) {
 530                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
 531                         break;
 532                 cpu_relax();
 533         }
 534         ihost_index = host_index;
 535         /*get command result and logical device */
 536         intr_reg = (unsigned char) (inb(IM_INTR_REG(ihost_index)));
 537         cmd_result = intr_reg & 0xf0;
 538         ldn = intr_reg & 0x0f;
 539         /* get the last_scsi_command here */
 540         lastSCSI = last_scsi_command(ihost_index)[ldn];
 541         outb(IM_EOI | ldn, IM_ATTN_REG(ihost_index));
 542
 543         /*these should never happen (hw fails, or a local programming bug) */
 544         if (!global_command_error_excuse) {
 545                 switch (cmd_result) {
 546                         /* Prevent from Ooopsing on error to show the real reason */
 547                 case IM_ADAPTER_HW_FAILURE:
 548                 case IM_SOFTWARE_SEQUENCING_ERROR:
 549                 case IM_CMD_ERROR:
 550                         printk(KERN_ERR "IBM MCA SCSI: Fatal Subsystem ERROR!\n");
 551                         printk(KERN_ERR "              Last cmd=0x%x, ena=%x, len=", lastSCSI, ld(ihost_index)[ldn].scb.enable);
 552                         if (ld(ihost_index)[ldn].cmd)
 553                                 printk("%ld/%ld,", (long) (ld(ihost_index)[ldn].cmd->request_bufflen), (long) (ld(ihost_index)[ldn].scb.sys_buf_length));
 554                         else
 555                                 printk("none,");
 556                         if (ld(ihost_index)[ldn].cmd)
 557                                 printk("Blocksize=%d", ld(ihost_index)[ldn].scb.u2.blk.length);
 558                         else
 559                                 printk("Blocksize=none");
 560                         printk(", host=0x%x, ldn=0x%x\n", ihost_index, ldn);
 561                         if (ld(ihost_index)[ldn].cmd) {
 562                                 printk(KERN_ERR "Blockcount=%d/%d\n", last_scsi_blockcount(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u2.blk.count);
 563                                 printk(KERN_ERR "Logical block=%lx/%lx\n", last_scsi_logical_block(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u1.log_blk_adr);
 564                         }
 565                         printk(KERN_ERR "Reason given: %s\n", (cmd_result == IM_ADAPTER_HW_FAILURE) ? "HARDWARE FAILURE" : (cmd_result == IM_SOFTWARE_SEQUENCING_ERROR) ? "SOFTWARE SEQUENCING ERROR" : (cmd_result == IM_CMD_ERROR) ? "COMMAND ERROR" : "UNKNOWN");
 566                         /* if errors appear, enter this section to give detailed info */
 567                         printk(KERN_ERR "IBM MCA SCSI: Subsystem Error-Status follows:\n");
 568                         printk(KERN_ERR "              Command Type................: %x\n", last_scsi_type(ihost_index)[ldn]);
 569                         printk(KERN_ERR "              Attention Register..........: %x\n", inb(IM_ATTN_REG(ihost_index)));
 570                         printk(KERN_ERR "              Basic Control Register......: %x\n", inb(IM_CTR_REG(ihost_index)));
 571                         printk(KERN_ERR "              Interrupt Status Register...: %x\n", intr_reg);
 572                         printk(KERN_ERR "              Basic Status Register.......: %x\n", inb(IM_STAT_REG(ihost_index)));
 573                         if ((last_scsi_type(ihost_index)[ldn] == IM_SCB) || (last_scsi_type(ihost_index)[ldn] == IM_LONG_SCB)) {
 574                                 printk(KERN_ERR "              SCB-Command.................: %x\n", ld(ihost_index)[ldn].scb.command);
 575                                 printk(KERN_ERR "              SCB-Enable..................: %x\n", ld(ihost_index)[ldn].scb.enable);
 576                                 printk(KERN_ERR "              SCB-logical block address...: %lx\n", ld(ihost_index)[ldn].scb.u1.log_blk_adr);
 577                                 printk(KERN_ERR "              SCB-system buffer address...: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_adr);
 578                                 printk(KERN_ERR "              SCB-system buffer length....: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_length);
 579                                 printk(KERN_ERR "              SCB-tsb address.............: %lx\n", ld(ihost_index)[ldn].scb.tsb_adr);
 580                                 printk(KERN_ERR "              SCB-Chain address...........: %lx\n", ld(ihost_index)[ldn].scb.scb_chain_adr);
 581                                 printk(KERN_ERR "              SCB-block count.............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.count);
 582                                 printk(KERN_ERR "              SCB-block length............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.length);
 583                         }
 584                         printk(KERN_ERR "              Send this report to the maintainer.\n");
 585                         panic("IBM MCA SCSI: Fatal error message from the subsystem (0x%X,0x%X)!\n", lastSCSI, cmd_result);
 586                         break;
 587                 }
 588         } else {
 589                 /* The command error handling is made silent, but we tell the
 590                  * calling function, that there is a reported error from the
 591                  * adapter. */
 592                 switch (cmd_result) {
 593                 case IM_ADAPTER_HW_FAILURE:
 594                 case IM_SOFTWARE_SEQUENCING_ERROR:
 595                 case IM_CMD_ERROR:
 596                         global_command_error_excuse = CMD_FAIL;
 597                         break;
 598                 default:
 599                         global_command_error_excuse = 0;
 600                         break;
 601                 }
 602         }
 603         /* if no panic appeared, increase the interrupt-counter */
 604         IBM_DS(ihost_index).total_interrupts++;
 605         /*only for local checking phase */
 606         if (local_checking_phase_flag(ihost_index)) {
 607                 stat_result(ihost_index) = cmd_result;
 608                 got_interrupt(ihost_index) = 1;
 609                 reset_status(ihost_index) = IM_RESET_FINISHED_OK;
 610                 last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 611                 spin_unlock(dev->host_lock);
 612                 return IRQ_HANDLED;
 613         }
 614         /* handling of commands coming from upper level of scsi driver */
 615         if (last_scsi_type(ihost_index)[ldn] == IM_IMM_CMD) {
 616                 /* verify ldn, and may handle rare reset immediate command */
 617                 if ((reset_status(ihost_index) == IM_RESET_IN_PROGRESS) && (last_scsi_command(ihost_index)[ldn] == IM_RESET_IMM_CMD)) {
 618                         if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
 619                                 disk_rw_in_progress = 0;
 620                                 PS2_DISK_LED_OFF();
 621                                 reset_status(ihost_index) = IM_RESET_FINISHED_FAIL;
 622                         } else {
 623                                 /*reset disk led counter, turn off disk led */
 624                                 disk_rw_in_progress = 0;
 625                                 PS2_DISK_LED_OFF();
 626                                 reset_status(ihost_index) = IM_RESET_FINISHED_OK;
 627                         }
 628                         stat_result(ihost_index) = cmd_result;
 629                         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 630                         last_scsi_type(ihost_index)[ldn] = 0;
 631                         spin_unlock(dev->host_lock);
 632                         return IRQ_HANDLED;
 633                 } else if (last_scsi_command(ihost_index)[ldn] == IM_ABORT_IMM_CMD) {
 634                         /* react on SCSI abort command */
 635 #ifdef IM_DEBUG_PROBE
 636                         printk("IBM MCA SCSI: Interrupt from SCSI-abort.\n");
 637 #endif
 638                         disk_rw_in_progress = 0;
 639                         PS2_DISK_LED_OFF();
 640                         cmd = ld(ihost_index)[ldn].cmd;
 641                         ld(ihost_index)[ldn].cmd = NULL;
 642                         if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
 643                                 cmd->result = DID_NO_CONNECT << 16;
 644                         else
 645                                 cmd->result = DID_ABORT << 16;
 646                         stat_result(ihost_index) = cmd_result;
 647                         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 648                         last_scsi_type(ihost_index)[ldn] = 0;
 649                         if (cmd->scsi_done)
 650                                 (cmd->scsi_done) (cmd); /* should be the internal_done */
 651                         spin_unlock(dev->host_lock);
 652                         return IRQ_HANDLED;
 653                 } else {
 654                         disk_rw_in_progress = 0;
 655                         PS2_DISK_LED_OFF();
 656                         reset_status(ihost_index) = IM_RESET_FINISHED_OK;
 657                         stat_result(ihost_index) = cmd_result;
 658                         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 659                         spin_unlock(dev->host_lock);
 660                         return IRQ_HANDLED;
 661                 }
 662         }
 663         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 664         last_scsi_type(ihost_index)[ldn] = 0;
 665         cmd = ld(ihost_index)[ldn].cmd;
 666         ld(ihost_index)[ldn].cmd = NULL;
 667 #ifdef IM_DEBUG_TIMEOUT
 668         if (cmd) {
 669                 if ((cmd->target == TIMEOUT_PUN) && (cmd->device->lun == TIMEOUT_LUN)) {
 670                         printk("IBM MCA SCSI: Ignoring interrupt from pun=%x, lun=%x.\n", cmd->target, cmd->device->lun);
 671                         return IRQ_HANDLED;
 672                 }
 673         }
 674 #endif
 675         /*if no command structure, just return, else clear cmd */
 676         if (!cmd)
 677         {
 678                 spin_unlock(dev->host_lock);
 679                 return IRQ_HANDLED;
 680         }
 681
 682 #ifdef IM_DEBUG_INT
 683         printk("cmd=%02x ireg=%02x ds=%02x cs=%02x de=%02x ce=%02x\n", cmd->cmnd[0], intr_reg, ld(ihost_index)[ldn].tsb.dev_status, ld(ihost_index)[ldn].tsb.cmd_status, ld(ihost_index)[ldn].tsb.dev_error, ld(ihost_index)[ldn].tsb.cmd_error);
 684 #endif
 685         /*if this is end of media read/write, may turn off PS/2 disk led */
 686         if ((ld(ihost_index)[ldn].device_type != TYPE_NO_LUN) && (ld(ihost_index)[ldn].device_type != TYPE_NO_DEVICE)) {
 687                 /* only access this, if there was a valid device addressed */
 688                 if (--disk_rw_in_progress == 0)
 689                         PS2_DISK_LED_OFF();
 690         }
 691
 692         /* IBM describes the status-mask to be 0x1e, but this is not conform
 693          * with SCSI-definition, I suppose, the reason for it is that IBM
 694          * adapters do not support CMD_TERMINATED, TASK_SET_FULL and
 695          * ACA_ACTIVE as returning statusbyte information. (ML) */
 696         if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
 697                 cmd->result = (unsigned char) (ld(ihost_index)[ldn].tsb.dev_status & 0x1e);
 698                 IBM_DS(ihost_index).total_errors++;
 699         } else
 700                 cmd->result = 0;
 701         /* write device status into cmd->result, and call done function */
 702         if (lastSCSI == NO_SCSI) {      /* unexpected interrupt :-( */
 703                 cmd->result |= DID_BAD_INTR << 16;
 704                 printk("IBM MCA SCSI: WARNING - Interrupt from non-pending SCSI-command!\n");
 705         } else                  /* things went right :-) */
 706                 cmd->result |= DID_OK << 16;
 707         if (cmd->scsi_done)
 708                 (cmd->scsi_done) (cmd);
 709         spin_unlock(dev->host_lock);
 710         return IRQ_HANDLED;
 711 }
 712
 713 static void issue_cmd(int host_index, unsigned long cmd_reg, unsigned char attn_reg)
 714 {
 715         unsigned long flags;
 716         /* must wait for attention reg not busy */
 717         while (1) {
 718                 spin_lock_irqsave(hosts[host_index]->host_lock, flags);
 719                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
 720                         break;
 721                 spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
 722         }
 723         /* write registers and enable system interrupts */
 724         outl(cmd_reg, IM_CMD_REG(host_index));
 725         outb(attn_reg, IM_ATTN_REG(host_index));
 726         spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
 727 }
 728
 729 static void internal_done(Scsi_Cmnd * cmd)
 730 {
 731         cmd->SCp.Status++;
 732         return;
 733 }
 734
 735 /* SCSI-SCB-command for device_inquiry */
 736 static int device_inquiry(int host_index, int ldn)
 737 {
 738         int retr;
 739         struct im_scb *scb;
 740         struct im_tsb *tsb;
 741         unsigned char *buf;
 742
 743         scb = &(ld(host_index)[ldn].scb);
 744         tsb = &(ld(host_index)[ldn].tsb);
 745         buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
 746         ld(host_index)[ldn].tsb.dev_status = 0; /* prepare statusblock */
 747         for (retr = 0; retr < 3; retr++) {
 748                 /* fill scb with inquiry command */
 749                 scb->command = IM_DEVICE_INQUIRY_CMD | IM_NO_DISCONNECT;
 750                 scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
 751                 last_scsi_command(host_index)[ldn] = IM_DEVICE_INQUIRY_CMD;
 752                 last_scsi_type(host_index)[ldn] = IM_SCB;
 753                 scb->sys_buf_adr = isa_virt_to_bus(buf);
 754                 scb->sys_buf_length = 255;      /* maximum bufferlength gives max info */
 755                 scb->tsb_adr = isa_virt_to_bus(tsb);
 756                 /* issue scb to passed ldn, and busy wait for interrupt */
 757                 got_interrupt(host_index) = 0;
 758                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
 759                 while (!got_interrupt(host_index))
 760                         barrier();
 761
 762                 /*if command successful, break */
 763                 if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
 764                         return 1;
 765         }
 766         /*if all three retries failed, return "no device at this ldn" */
 767         if (retr >= 3)
 768                 return 0;
 769         else
 770                 return 1;
 771 }
 772
 773 static int read_capacity(int host_index, int ldn)
 774 {
 775         int retr;
 776         struct im_scb *scb;
 777         struct im_tsb *tsb;
 778         unsigned char *buf;
 779
 780         scb = &(ld(host_index)[ldn].scb);
 781         tsb = &(ld(host_index)[ldn].tsb);
 782         buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
 783         ld(host_index)[ldn].tsb.dev_status = 0;
 784         for (retr = 0; retr < 3; retr++) {
 785                 /*fill scb with read capacity command */
 786                 scb->command = IM_READ_CAPACITY_CMD;
 787                 scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
 788                 last_scsi_command(host_index)[ldn] = IM_READ_CAPACITY_CMD;
 789                 last_scsi_type(host_index)[ldn] = IM_SCB;
 790                 scb->sys_buf_adr = isa_virt_to_bus(buf);
 791                 scb->sys_buf_length = 8;
 792                 scb->tsb_adr = isa_virt_to_bus(tsb);
 793                 /*issue scb to passed ldn, and busy wait for interrupt */
 794                 got_interrupt(host_index) = 0;
 795                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
 796                 while (!got_interrupt(host_index))
 797                         barrier();
 798
 799                 /*if got capacity, get block length and return one device found */
 800                 if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
 801                         return 1;
 802         }
 803         /*if all three retries failed, return "no device at this ldn" */
 804         if (retr >= 3)
 805                 return 0;
 806         else
 807                 return 1;
 808 }
 809
 810 static int get_pos_info(int host_index)
 811 {
 812         int retr;
 813         struct im_scb *scb;
 814         struct im_tsb *tsb;
 815         unsigned char *buf;
 816
 817         scb = &(ld(host_index)[MAX_LOG_DEV].scb);
 818         tsb = &(ld(host_index)[MAX_LOG_DEV].tsb);
 819         buf = (unsigned char *) (&(ld(host_index)[MAX_LOG_DEV].buf));
 820         ld(host_index)[MAX_LOG_DEV].tsb.dev_status = 0;
 821         for (retr = 0; retr < 3; retr++) {
 822                 /*fill scb with get_pos_info command */
 823                 scb->command = IM_GET_POS_INFO_CMD;
 824                 scb->enable = IM_READ_CONTROL | IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
 825                 last_scsi_command(host_index)[MAX_LOG_DEV] = IM_GET_POS_INFO_CMD;
 826                 last_scsi_type(host_index)[MAX_LOG_DEV] = IM_SCB;
 827                 scb->sys_buf_adr = isa_virt_to_bus(buf);
 828                 if (special(host_index) == IBM_SCSI2_FW)
 829                         scb->sys_buf_length = 256;      /* get all info from F/W adapter */
 830                 else
 831                         scb->sys_buf_length = 18;       /* get exactly 18 bytes for other SCSI */
 832                 scb->tsb_adr = isa_virt_to_bus(tsb);
 833                 /*issue scb to ldn=15, and busy wait for interrupt */
 834                 got_interrupt(host_index) = 0;
 835                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | MAX_LOG_DEV);
 836
 837                 /* FIXME: timeout */
 838                 while (!got_interrupt(host_index))
 839                         barrier();
 840
 841                 /*if got POS-stuff, get block length and return one device found */
 842                 if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
 843                         return 1;
 844         }
 845         /* if all three retries failed, return "no device at this ldn" */
 846         if (retr >= 3)
 847                 return 0;
 848         else
 849                 return 1;
 850 }
 851
 852 /* SCSI-immediate-command for assign. This functions maps/unmaps specific
 853  ldn-numbers on SCSI (PUN,LUN). It is needed for presetting of the
 854  subsystem and for dynamical remapping od ldns. */
 855 static int immediate_assign(int host_index, unsigned int pun, unsigned int lun, unsigned int ldn, unsigned int operation)
 856 {
 857         int retr;
 858         unsigned long imm_cmd;
 859
 860         for (retr = 0; retr < 3; retr++) {
 861                 /* select mutation level of the SCSI-adapter */
 862                 switch (special(host_index)) {
 863                 case IBM_SCSI2_FW:
 864                         imm_cmd = (unsigned long) (IM_ASSIGN_IMM_CMD);
 865                         imm_cmd |= (unsigned long) ((lun & 7) << 24);
 866                         imm_cmd |= (unsigned long) ((operation & 1) << 23);
 867                         imm_cmd |= (unsigned long) ((pun & 7) << 20) | ((pun & 8) << 24);
 868                         imm_cmd |= (unsigned long) ((ldn & 15) << 16);
 869                         break;
 870                 default:
 871                         imm_cmd = inl(IM_CMD_REG(host_index));
 872                         imm_cmd &= (unsigned long) (0xF8000000);        /* keep reserved bits */
 873                         imm_cmd |= (unsigned long) (IM_ASSIGN_IMM_CMD);
 874                         imm_cmd |= (unsigned long) ((lun & 7) << 24);
 875                         imm_cmd |= (unsigned long) ((operation & 1) << 23);
 876                         imm_cmd |= (unsigned long) ((pun & 7) << 20);
 877                         imm_cmd |= (unsigned long) ((ldn & 15) << 16);
 878                         break;
 879                 }
 880                 last_scsi_command(host_index)[MAX_LOG_DEV] = IM_ASSIGN_IMM_CMD;
 881                 last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
 882                 got_interrupt(host_index) = 0;
 883                 issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
 884                 while (!got_interrupt(host_index))
 885                         barrier();
 886
 887                 /*if command successful, break */
 888                 if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
 889                         return 1;
 890         }
 891         if (retr >= 3)
 892                 return 0;
 893         else
 894                 return 1;
 895 }
 896
 897 static int immediate_feature(int host_index, unsigned int speed, unsigned int timeout)
 898 {
 899         int retr;
 900         unsigned long imm_cmd;
 901
 902         for (retr = 0; retr < 3; retr++) {
 903                 /* select mutation level of the SCSI-adapter */
 904                 imm_cmd = IM_FEATURE_CTR_IMM_CMD;
 905                 imm_cmd |= (unsigned long) ((speed & 0x7) << 29);
 906                 imm_cmd |= (unsigned long) ((timeout & 0x1fff) << 16);
 907                 last_scsi_command(host_index)[MAX_LOG_DEV] = IM_FEATURE_CTR_IMM_CMD;
 908                 last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
 909                 got_interrupt(host_index) = 0;
 910                 /* we need to run into command errors in order to probe for the
 911                  * right speed! */
 912                 global_command_error_excuse = 1;
 913                 issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
 914
 915                 /* FIXME: timeout */
 916                 while (!got_interrupt(host_index))
 917                         barrier();
 918                 if (global_command_error_excuse == CMD_FAIL) {
 919                         global_command_error_excuse = 0;
 920                         return 2;
 921                 } else
 922                         global_command_error_excuse = 0;
 923                 /*if command successful, break */
 924                 if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
 925                         return 1;
 926         }
 927         if (retr >= 3)
 928                 return 0;
 929         else
 930                 return 1;
 931 }
 932
 933 #ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
 934 static int immediate_reset(int host_index, unsigned int ldn)
 935 {
 936         int retries;
 937         int ticks;
 938         unsigned long imm_command;
 939
 940         for (retries = 0; retries < 3; retries++) {
 941                 imm_command = inl(IM_CMD_REG(host_index));
 942                 imm_command &= (unsigned long) (0xFFFF0000);    /* keep reserved bits */
 943                 imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
 944                 last_scsi_command(host_index)[ldn] = IM_RESET_IMM_CMD;
 945                 last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
 946                 got_interrupt(host_index) = 0;
 947                 reset_status(host_index) = IM_RESET_IN_PROGRESS;
 948                 issue_cmd(host_index, (unsigned long) (imm_command), IM_IMM_CMD | ldn);
 949                 ticks = IM_RESET_DELAY * HZ;
 950                 while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks) {
 951                         udelay((1 + 999 / HZ) * 1000);
 952                         barrier();
 953                 }
 954                 /* if reset did not complete, just complain */
 955                 if (!ticks) {
 956                         printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
 957                         reset_status(host_index) = IM_RESET_FINISHED_OK;
 958                         /* did not work, finish */
 959                         return 1;
 960                 }
 961                 /*if command successful, break */
 962                 if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
 963                         return 1;
 964         }
 965         if (retries >= 3)
 966                 return 0;
 967         else
 968                 return 1;
 969 }
 970 #endif
 971
 972 /* type-interpreter for physical device numbers */
 973 static char *ti_p(int dev)
 974 {
 975         switch (dev) {
 976         case TYPE_IBM_SCSI_ADAPTER:
 977                 return ("A");
 978         case TYPE_DISK:
 979                 return ("D");
 980         case TYPE_TAPE:
 981                 return ("T");
 982         case TYPE_PROCESSOR:
 983                 return ("P");
 984         case TYPE_WORM:
 985                 return ("W");
 986         case TYPE_ROM:
 987                 return ("R");
 988         case TYPE_SCANNER:
 989                 return ("S");
 990         case TYPE_MOD:
 991                 return ("M");
 992         case TYPE_MEDIUM_CHANGER:
 993                 return ("C");
 994         case TYPE_NO_LUN:
 995                 return ("+");   /* show NO_LUN */
 996         }
 997         return ("-");           /* TYPE_NO_DEVICE and others */
 998 }
 999
1000 /* interpreter for logical device numbers (ldn) */
1001 static char *ti_l(int val)
1002 {
1003         const char hex[16] = "0123456789abcdef";
1004         static char answer[2];
1005
1006         answer[1] = (char) (0x0);
1007         if (val <= MAX_LOG_DEV)
1008                 answer[0] = hex[val];
1009         else
1010                 answer[0] = '-';
1011         return (char *) &answer;
1012 }
1013
1014 /* transfers bitpattern of the feature command to values in MHz */
1015 static char *ibmrate(unsigned int speed, int i)
1016 {
1017         switch (speed) {
1018         case 0:
1019                 return i ? "5.00" : "10.00";
1020         case 1:
1021                 return i ? "4.00" : "8.00";
1022         case 2:
1023                 return i ? "3.33" : "6.66";
1024         case 3:
1025                 return i ? "2.86" : "5.00";
1026         case 4:
1027                 return i ? "2.50" : "4.00";
1028         case 5:
1029                 return i ? "2.22" : "3.10";
1030         case 6:
1031                 return i ? "2.00" : "2.50";
1032         case 7:
1033                 return i ? "1.82" : "2.00";
1034         }
1035         return "---";
1036 }
1037
1038 static int probe_display(int what)
1039 {
1040         static int rotator = 0;
1041         const char rotor[] = "|/-\\";
1042
1043         if (!(display_mode & LED_DISP))
1044                 return 0;
1045         if (!what) {
1046                 outl(0x20202020, MOD95_LED_PORT);
1047                 outl(0x20202020, MOD95_LED_PORT + 4);
1048         } else {
1049                 outb('S', MOD95_LED_PORT + 7);
1050                 outb('C', MOD95_LED_PORT + 6);
1051                 outb('S', MOD95_LED_PORT + 5);
1052                 outb('I', MOD95_LED_PORT + 4);
1053                 outb('i', MOD95_LED_PORT + 3);
1054                 outb('n', MOD95_LED_PORT + 2);
1055                 outb('i', MOD95_LED_PORT + 1);
1056                 outb((char) (rotor[rotator]), MOD95_LED_PORT);
1057                 rotator++;
1058                 if (rotator > 3)
1059                         rotator = 0;
1060         }
1061         return 0;
1062 }
1063
1064 static int probe_bus_mode(int host_index)
1065 {
1066         struct im_pos_info *info;
1067         int num_bus = 0;
1068         int ldn;
1069
1070         info = (struct im_pos_info *) (&(ld(host_index)[MAX_LOG_DEV].buf));
1071         if (get_pos_info(host_index)) {
1072                 if (info->connector_size & 0xf000)
1073                         subsystem_connector_size(host_index) = 16;
1074                 else
1075                         subsystem_connector_size(host_index) = 32;
1076                 num_bus |= (info->pos_4b & 8) >> 3;
1077                 for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1078                         if ((special(host_index) == IBM_SCSI_WCACHE) || (special(host_index) == IBM_7568_WCACHE)) {
1079                                 if (!((info->cache_stat >> ldn) & 1))
1080                                         ld(host_index)[ldn].cache_flag = 0;
1081                         }
1082                         if (!((info->retry_stat >> ldn) & 1))
1083                                 ld(host_index)[ldn].retry_flag = 0;
1084                 }
1085 #ifdef IM_DEBUG_PROBE
1086                 printk("IBM MCA SCSI: SCSI-Cache bits: ");
1087                 for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1088                         printk("%d", ld(host_index)[ldn].cache_flag);
1089                 }
1090                 printk("\nIBM MCA SCSI: SCSI-Retry bits: ");
1091                 for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1092                         printk("%d", ld(host_index)[ldn].retry_flag);
1093                 }
1094                 printk("\n");
1095 #endif
1096         }
1097         return num_bus;
1098 }
1099
1100 /* probing scsi devices */
1101 static void check_devices(int host_index, int adaptertype)
1102 {
1103         int id, lun, ldn, ticks;
1104         int count_devices;      /* local counter for connected device */
1105         int max_pun;
1106         int num_bus;
1107         int speedrun;           /* local adapter_speed check variable */
1108
1109         /* assign default values to certain variables */
1110         ticks = 0;
1111         count_devices = 0;
1112         IBM_DS(host_index).dyn_flag = 0;        /* normally no need for dynamical ldn management */
1113         IBM_DS(host_index).total_errors = 0;    /* set errorcounter to 0 */
1114         next_ldn(host_index) = 7;       /* next ldn to be assigned is 7, because 0-6 is 'hardwired' */
1115
1116         /* initialize the very important driver-informational arrays/structs */
1117         memset(ld(host_index), 0, sizeof(ld(host_index)));
1118         for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1119                 last_scsi_command(host_index)[ldn] = NO_SCSI;   /* emptify last SCSI-command storage */
1120                 last_scsi_type(host_index)[ldn] = 0;
1121                 ld(host_index)[ldn].cache_flag = 1;
1122                 ld(host_index)[ldn].retry_flag = 1;
1123         }
1124         memset(get_ldn(host_index), TYPE_NO_DEVICE, sizeof(get_ldn(host_index)));       /* this is essential ! */
1125         memset(get_scsi(host_index), TYPE_NO_DEVICE, sizeof(get_scsi(host_index)));     /* this is essential ! */
1126         for (lun = 0; lun < 8; lun++) {
1127                 /* mark the adapter at its pun on all luns */
1128                 get_scsi(host_index)[subsystem_pun(host_index)][lun] = TYPE_IBM_SCSI_ADAPTER;
1129                 get_ldn(host_index)[subsystem_pun(host_index)][lun] = MAX_LOG_DEV;      /* make sure, the subsystem
1130                                                                                            ldn is active for all
1131                                                                                            luns. */
1132         }
1133         probe_display(0);       /* Supercool display usage during SCSI-probing. */
1134         /* This makes sense, when booting without any */
1135         /* monitor connected on model XX95. */
1136
1137         /* STEP 1: */
1138         adapter_speed(host_index) = global_adapter_speed;
1139         speedrun = adapter_speed(host_index);
1140         while (immediate_feature(host_index, speedrun, adapter_timeout) == 2) {
1141                 probe_display(1);
1142                 if (speedrun == 7)
1143                         panic("IBM MCA SCSI: Cannot set Synchronous-Transfer-Rate!\n");
1144                 speedrun++;
1145                 if (speedrun > 7)
1146                         speedrun = 7;
1147         }
1148         adapter_speed(host_index) = speedrun;
1149         /* Get detailed information about the current adapter, necessary for
1150          * device operations: */
1151         num_bus = probe_bus_mode(host_index);
1152
1153         /* num_bus contains only valid data for the F/W adapter! */
1154         if (adaptertype == IBM_SCSI2_FW) {      /* F/W SCSI adapter: */
1155                 /* F/W adapter PUN-space extension evaluation: */
1156                 if (num_bus) {
1157                         printk(KERN_INFO "IBM MCA SCSI: Separate bus mode (wide-addressing enabled)\n");
1158                         subsystem_maxid(host_index) = 16;
1159                 } else {
1160                         printk(KERN_INFO "IBM MCA SCSI: Combined bus mode (wide-addressing disabled)\n");
1161                         subsystem_maxid(host_index) = 8;
1162                 }
1163                 printk(KERN_INFO "IBM MCA SCSI: Sync.-Rate (F/W: 20, Int.: 10, Ext.: %s) MBytes/s\n", ibmrate(speedrun, adaptertype));
1164         } else                  /* all other IBM SCSI adapters: */
1165                 printk(KERN_INFO "IBM MCA SCSI: Synchronous-SCSI-Transfer-Rate: %s MBytes/s\n", ibmrate(speedrun, adaptertype));
1166
1167         /* assign correct PUN device space */
1168         max_pun = subsystem_maxid(host_index);
1169
1170 #ifdef IM_DEBUG_PROBE
1171         printk("IBM MCA SCSI: Current SCSI-host index: %d\n", host_index);
1172         printk("IBM MCA SCSI: Removing default logical SCSI-device mapping.");
1173 #else
1174         printk(KERN_INFO "IBM MCA SCSI: Dev. Order: %s, Mapping (takes <2min): ", (ibm_ansi_order) ? "ANSI" : "New");
1175 #endif
1176         for (ldn = 0; ldn < MAX_LOG_DEV; ldn++) {
1177                 probe_display(1);
1178 #ifdef IM_DEBUG_PROBE
1179                 printk(".");
1180 #endif
1181                 immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN);    /* remove ldn (wherever) */
1182         }
1183         lun = 0;                /* default lun is 0 */
1184 #ifndef IM_DEBUG_PROBE
1185         printk("cleared,");
1186 #endif
1187         /* STEP 2: */
1188 #ifdef IM_DEBUG_PROBE
1189         printk("\nIBM MCA SCSI: Scanning SCSI-devices.");
1190 #endif
1191         for (id = 0; id < max_pun; id++)
1192 #ifdef CONFIG_SCSI_MULTI_LUN
1193                 for (lun = 0; lun < 8; lun++)
1194 #endif
1195                 {
1196                         probe_display(1);
1197 #ifdef IM_DEBUG_PROBE
1198                         printk(".");
1199 #endif
1200                         if (id != subsystem_pun(host_index)) {
1201                                 /* if pun is not the adapter: */
1202                                 /* set ldn=0 to pun,lun */
1203                                 immediate_assign(host_index, id, lun, PROBE_LDN, SET_LDN);
1204                                 if (device_inquiry(host_index, PROBE_LDN)) {    /* probe device */
1205                                         get_scsi(host_index)[id][lun] = (unsigned char) (ld(host_index)[PROBE_LDN].buf[0]);
1206                                         /* entry, even for NO_LUN */
1207                                         if (ld(host_index)[PROBE_LDN].buf[0] != TYPE_NO_LUN)
1208                                                 count_devices++;        /* a existing device is found */
1209                                 }
1210                                 /* remove ldn */
1211                                 immediate_assign(host_index, id, lun, PROBE_LDN, REMOVE_LDN);
1212                         }
1213                 }
1214 #ifndef IM_DEBUG_PROBE
1215         printk("scanned,");
1216 #endif
1217         /* STEP 3: */
1218 #ifdef IM_DEBUG_PROBE
1219         printk("\nIBM MCA SCSI: Mapping SCSI-devices.");
1220 #endif
1221         ldn = 0;
1222         lun = 0;
1223 #ifdef CONFIG_SCSI_MULTI_LUN
1224         for (lun = 0; lun < 8 && ldn < MAX_LOG_DEV; lun++)
1225 #endif
1226                 for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
1227                         probe_display(1);
1228 #ifdef IM_DEBUG_PROBE
1229                         printk(".");
1230 #endif
1231                         if (id != subsystem_pun(host_index)) {
1232                                 if (get_scsi(host_index)[id][lun] != TYPE_NO_LUN && get_scsi(host_index)[id][lun] != TYPE_NO_DEVICE) {
1233                                         /* Only map if accepted type. Always enter for
1234                                            lun == 0 to get no gaps into ldn-mapping for ldn<7. */
1235                                         immediate_assign(host_index, id, lun, ldn, SET_LDN);
1236                                         get_ldn(host_index)[id][lun] = ldn;     /* map ldn */
1237                                         if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
1238 #ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
1239                                                 printk("resetting device at ldn=%x ... ", ldn);
1240                                                 immediate_reset(host_index, ldn);
1241 #endif
1242                                                 ldn++;
1243                                         } else {
1244                                                 /* device vanished, probably because we don't know how to
1245                                                  * handle it or because it has problems */
1246                                                 if (lun > 0) {
1247                                                         /* remove mapping */
1248                                                         get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
1249                                                         immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN);
1250                                                 } else
1251                                                         ldn++;
1252                                         }
1253                                 } else if (lun == 0) {
1254                                         /* map lun == 0, even if no device exists */
1255                                         immediate_assign(host_index, id, lun, ldn, SET_LDN);
1256                                         get_ldn(host_index)[id][lun] = ldn;     /* map ldn */
1257                                         ldn++;
1258                                 }
1259                         }
1260                 }
1261         /* STEP 4: */
1262
1263         /* map remaining ldns to non-existing devices */
1264         for (lun = 1; lun < 8 && ldn < MAX_LOG_DEV; lun++)
1265                 for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
1266                         if (get_scsi(host_index)[id][lun] == TYPE_NO_LUN || get_scsi(host_index)[id][lun] == TYPE_NO_DEVICE) {
1267                                 probe_display(1);
1268                                 /* Map remaining ldns only to NON-existing pun,lun
1269                                    combinations to make sure an inquiry will fail.
1270                                    For MULTI_LUN, it is needed to avoid adapter autonome
1271                                    SCSI-remapping. */
1272                                 immediate_assign(host_index, id, lun, ldn, SET_LDN);
1273                                 get_ldn(host_index)[id][lun] = ldn;
1274                                 ldn++;
1275                         }
1276                 }
1277 #ifndef IM_DEBUG_PROBE
1278         printk("mapped.");
1279 #endif
1280         printk("\n");
1281 #ifdef IM_DEBUG_PROBE
1282         if (ibm_ansi_order)
1283                 printk("IBM MCA SCSI: Device order: IBM/ANSI (pun=7 is first).\n");
1284         else
1285                 printk("IBM MCA SCSI: Device order: New Industry Standard (pun=0 is first).\n");
1286 #endif
1287
1288 #ifdef IM_DEBUG_PROBE
1289         /* Show the physical and logical mapping during boot. */
1290         printk("IBM MCA SCSI: Determined SCSI-device-mapping:\n");
1291         printk("    Physical SCSI-Device Map               Logical SCSI-Device Map\n");
1292         printk("ID\\LUN  0  1  2  3  4  5  6  7       ID\\LUN  0  1  2  3  4  5  6  7\n");
1293         for (id = 0; id < max_pun; id++) {
1294                 printk("%2d     ", id);
1295                 for (lun = 0; lun < 8; lun++)
1296                         printk("%2s ", ti_p(get_scsi(host_index)[id][lun]));
1297                 printk("      %2d     ", id);
1298                 for (lun = 0; lun < 8; lun++)
1299                         printk("%2s ", ti_l(get_ldn(host_index)[id][lun]));
1300                 printk("\n");
1301         }
1302 #endif
1303
1304         /* assign total number of found SCSI-devices to the statistics struct */
1305         IBM_DS(host_index).total_scsi_devices = count_devices;
1306
1307         /* decide for output in /proc-filesystem, if the configuration of
1308            SCSI-devices makes dynamical reassignment of devices necessary */
1309         if (count_devices >= MAX_LOG_DEV)
1310                 IBM_DS(host_index).dyn_flag = 1;        /* dynamical assignment is necessary */
1311         else
1312                 IBM_DS(host_index).dyn_flag = 0;        /* dynamical assignment is not necessary */
1313
1314         /* If no SCSI-devices are assigned, return 1 in order to cause message. */
1315         if (ldn == 0)
1316                 printk("IBM MCA SCSI: Warning: No SCSI-devices found/assigned!\n");
1317
1318         /* reset the counters for statistics on the current adapter */
1319         IBM_DS(host_index).scbs = 0;
1320         IBM_DS(host_index).long_scbs = 0;
1321         IBM_DS(host_index).total_accesses = 0;
1322         IBM_DS(host_index).total_interrupts = 0;
1323         IBM_DS(host_index).dynamical_assignments = 0;
1324         memset(IBM_DS(host_index).ldn_access, 0x0, sizeof(IBM_DS(host_index).ldn_access));
1325         memset(IBM_DS(host_index).ldn_read_access, 0x0, sizeof(IBM_DS(host_index).ldn_read_access));
1326         memset(IBM_DS(host_index).ldn_write_access, 0x0, sizeof(IBM_DS(host_index).ldn_write_access));
1327         memset(IBM_DS(host_index).ldn_inquiry_access, 0x0, sizeof(IBM_DS(host_index).ldn_inquiry_access));
1328         memset(IBM_DS(host_index).ldn_modeselect_access, 0x0, sizeof(IBM_DS(host_index).ldn_modeselect_access));
1329         memset(IBM_DS(host_index).ldn_assignments, 0x0, sizeof(IBM_DS(host_index).ldn_assignments));
1330         probe_display(0);
1331         return;
1332 }
1333
1334 static int device_exists(int host_index, int ldn, int *block_length, int *device_type)
1335 {
1336         unsigned char *buf;
1337         /* if no valid device found, return immediately with 0 */
1338         if (!(device_inquiry(host_index, ldn)))
1339                 return 0;
1340         buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
1341         if (*buf == TYPE_ROM) {
1342                 *device_type = TYPE_ROM;
1343                 *block_length = 2048;   /* (standard blocksize for yellow-/red-book) */
1344                 return 1;
1345         }
1346         if (*buf == TYPE_WORM) {
1347                 *device_type = TYPE_WORM;
1348                 *block_length = 2048;
1349                 return 1;
1350         }
1351         if (*buf == TYPE_DISK) {
1352                 *device_type = TYPE_DISK;
1353                 if (read_capacity(host_index, ldn)) {
1354                         *block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
1355                         return 1;
1356                 } else
1357                         return 0;
1358         }
1359         if (*buf == TYPE_MOD) {
1360                 *device_type = TYPE_MOD;
1361                 if (read_capacity(host_index, ldn)) {
1362                         *block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
1363                         return 1;
1364                 } else
1365                         return 0;
1366         }
1367         if (*buf == TYPE_TAPE) {
1368                 *device_type = TYPE_TAPE;
1369                 *block_length = 0;      /* not in use (setting by mt and mtst in op.) */
1370                 return 1;
1371         }
1372         if (*buf == TYPE_PROCESSOR) {
1373                 *device_type = TYPE_PROCESSOR;
1374                 *block_length = 0;      /* they set their stuff on drivers */
1375                 return 1;
1376         }
1377         if (*buf == TYPE_SCANNER) {
1378                 *device_type = TYPE_SCANNER;
1379                 *block_length = 0;      /* they set their stuff on drivers */
1380                 return 1;
1381         }
1382         if (*buf == TYPE_MEDIUM_CHANGER) {
1383                 *device_type = TYPE_MEDIUM_CHANGER;
1384                 *block_length = 0;      /* One never knows, what to expect on a medium
1385                                            changer device. */
1386                 return 1;
1387         }
1388         return 0;
1389 }
1390
1391 static void internal_ibmmca_scsi_setup(char *str, int *ints)
1392 {
1393         int i, j, io_base, id_base;
1394         char *token;
1395
1396         io_base = 0;
1397         id_base = 0;
1398         if (str) {
1399                 j = 0;
1400                 while ((token = strsep(&str, ",")) != NULL) {
1401                         if (!strcmp(token, "activity"))
1402                                 display_mode |= LED_ACTIVITY;
1403                         if (!strcmp(token, "display"))
1404                                 display_mode |= LED_DISP;
1405                         if (!strcmp(token, "adisplay"))
1406                                 display_mode |= LED_ADISP;
1407                         if (!strcmp(token, "normal"))
1408                                 ibm_ansi_order = 0;
1409                         if (!strcmp(token, "ansi"))
1410                                 ibm_ansi_order = 1;
1411                         if (!strcmp(token, "fast"))
1412                                 global_adapter_speed = 0;
1413                         if (!strcmp(token, "medium"))
1414                                 global_adapter_speed = 4;
1415                         if (!strcmp(token, "slow"))
1416                                 global_adapter_speed = 7;
1417                         if ((*token == '-') || (isdigit(*token))) {
1418                                 if (!(j % 2) && (io_base < IM_MAX_HOSTS))
1419                                         io_port[io_base++] = simple_strtoul(token, NULL, 0);
1420                                 if ((j % 2) && (id_base < IM_MAX_HOSTS))
1421                                         scsi_id[id_base++] = simple_strtoul(token, NULL, 0);
1422                                 j++;
1423                         }
1424                 }
1425         } else if (ints) {
1426                 for (i = 0; i < IM_MAX_HOSTS && 2 * i + 2 < ints[0]; i++) {
1427                         io_port[i] = ints[2 * i + 2];
1428                         scsi_id[i] = ints[2 * i + 2];
1429                 }
1430         }
1431         return;
1432 }
1433
1434 static int ibmmca_getinfo(char *buf, int slot, void *dev_id)
1435 {
1436         struct Scsi_Host *shpnt;
1437         int len, speciale, connectore, k;
1438         unsigned int pos[8];
1439         unsigned long flags;
1440         struct Scsi_Host *dev = dev_id;
1441
1442         spin_lock_irqsave(dev->host_lock, flags);
1443
1444         shpnt = dev;            /* assign host-structure to local pointer */
1445         len = 0;                /* set filled text-buffer index to 0 */
1446         /* get the _special contents of the hostdata structure */
1447         speciale = ((struct ibmmca_hostdata *) shpnt->hostdata)->_special;
1448         connectore = ((struct ibmmca_hostdata *) shpnt->hostdata)->_connector_size;
1449         for (k = 2; k < 4; k++)
1450                 pos[k] = ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k];
1451         if (speciale == FORCED_DETECTION) {     /* forced detection */
1452                 len += sprintf(buf + len,
1453                                "Adapter category: forced detected\n" "***************************************\n" "***  Forced detected SCSI Adapter   ***\n" "***  No chip-information available  ***\n" "***************************************\n");
1454         } else if (speciale == INTEGRATED_SCSI) {
1455                 /* if the integrated subsystem has been found automatically: */
1456                 len += sprintf(buf + len,
1457                                "Adapter category: integrated\n" "Chip revision level: %d\n" "Chip status: %s\n" "8 kByte NVRAM status: %s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 1) ? "enabled" : "disabled", (pos[2] & 2) ? "locked" : "accessible");
1458         } else if ((speciale >= 0) && (speciale < ARRAY_SIZE(subsys_list))) {
1459                 /* if the subsystem is a slot adapter */
1460                 len += sprintf(buf + len, "Adapter category: slot-card\n" "ROM Segment Address: ");
1461                 if ((pos[2] & 0xf0) == 0xf0)
1462                         len += sprintf(buf + len, "off\n");
1463                 else
1464                         len += sprintf(buf + len, "0x%x\n", ((pos[2] & 0xf0) << 13) + 0xc0000);
1465                 len += sprintf(buf + len, "Chip status: %s\n", (pos[2] & 1) ? "enabled" : "disabled");
1466                 len += sprintf(buf + len, "Adapter I/O Offset: 0x%x\n", ((pos[2] & 0x0e) << 2));
1467         } else {
1468                 len += sprintf(buf + len, "Adapter category: unknown\n");
1469         }
1470         /* common subsystem information to write to the slotn file */
1471         len += sprintf(buf + len, "Subsystem PUN: %d\n", shpnt->this_id);
1472         len += sprintf(buf + len, "I/O base address range: 0x%x-0x%x\n", (unsigned int) (shpnt->io_port), (unsigned int) (shpnt->io_port + 7));
1473         len += sprintf(buf + len, "MCA-slot size: %d bits", connectore);
1474         /* Now make sure, the bufferlength is devidable by 4 to avoid
1475          * paging problems of the buffer. */
1476         while (len % sizeof(int) != (sizeof(int) - 1))
1477                 len += sprintf(buf + len, " ");
1478         len += sprintf(buf + len, "\n");
1479
1480         spin_unlock_irqrestore(shpnt->host_lock, flags);
1481
1482         return len;
1483 }
1484
1485 int ibmmca_detect(struct scsi_host_template * scsi_template)
1486 {
1487         struct Scsi_Host *shpnt;
1488         int port, id, i, j, k, slot;
1489         int devices_on_irq_11 = 0;
1490         int devices_on_irq_14 = 0;
1491         int IRQ14_registered = 0;
1492         int IRQ11_registered = 0;
1493
1494         found = 0;              /* make absolutely sure, that found is set to 0 */
1495
1496         /* First of all, print the version number of the driver. This is
1497          * important to allow better user bugreports in case of already
1498          * having problems with the MCA_bus probing. */
1499         printk(KERN_INFO "IBM MCA SCSI: Version %s\n", IBMMCA_SCSI_DRIVER_VERSION);
1500         /* if this is not MCA machine, return "nothing found" */
1501         if (!MCA_bus) {
1502                 printk(KERN_INFO "IBM MCA SCSI:  No Microchannel-bus present --> Aborting.\n" "              This machine does not have any IBM MCA-bus\n" "                 or the MCA-Kernel-support is not enabled!\n");
1503                 return 0;
1504         }
1505
1506 #ifdef MODULE
1507         /* If the driver is run as module, read from conf.modules or cmd-line */
1508         if (boot_options)
1509                 option_setup(boot_options);
1510 #endif
1511
1512         /* get interrupt request level */
1513         if (request_irq(IM_IRQ, interrupt_handler, IRQF_SHARED, "ibmmcascsi", hosts)) {
1514                 printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ);
1515                 return 0;
1516         } else
1517                 IRQ14_registered++;
1518
1519         /* if ibmmcascsi setup option was passed to kernel, return "found" */
1520         for (i = 0; i < IM_MAX_HOSTS; i++)
1521                 if (io_port[i] > 0 && scsi_id[i] >= 0 && scsi_id[i] < 8) {
1522                         printk("IBM MCA SCSI: forced detected SCSI Adapter, io=0x%x, scsi id=%d.\n", io_port[i], scsi_id[i]);
1523                         if ((shpnt = ibmmca_register(scsi_template, io_port[i], scsi_id[i], FORCED_DETECTION, "forced detected SCSI Adapter"))) {
1524                                 for (k = 2; k < 7; k++)
1525                                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = 0;
1526                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = FORCED_DETECTION;
1527                                 mca_set_adapter_name(MCA_INTEGSCSI, "forced detected SCSI Adapter");
1528                                 mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1529                                 mca_mark_as_used(MCA_INTEGSCSI);
1530                                 devices_on_irq_14++;
1531                         }
1532                 }
1533         if (found)
1534                 return found;
1535
1536         /* The POS2-register of all PS/2 model SCSI-subsystems has the following
1537          * interpretation of bits:
1538          *                             Bit 7 - 4 : Chip Revision ID (Release)
1539          *                             Bit 3 - 2 : Reserved
1540          *                             Bit 1     : 8k NVRAM Disabled
1541          *                             Bit 0     : Chip Enable (EN-Signal)
1542          * The POS3-register is interpreted as follows:
1543          *                             Bit 7 - 5 : SCSI ID
1544          *                             Bit 4     : Reserved = 0
1545          *                             Bit 3 - 0 : Reserved = 0
1546          * (taken from "IBM, PS/2 Hardware Interface Technical Reference, Common
1547          * Interfaces (1991)").
1548          * In short words, this means, that IBM PS/2 machines only support
1549          * 1 single subsystem by default. The slot-adapters must have another
1550          * configuration on pos2. Here, one has to assume the following
1551          * things for POS2-register:
1552          *                             Bit 7 - 4 : Chip Revision ID (Release)
1553          *                             Bit 3 - 1 : port offset factor
1554          *                             Bit 0     : Chip Enable (EN-Signal)
1555          * As I found a patch here, setting the IO-registers to 0x3540 forced,
1556          * as there was a 0x05 in POS2 on a model 56, I assume, that the
1557          * port 0x3540 must be fix for integrated SCSI-controllers.
1558          * Ok, this discovery leads to the following implementation: (M.Lang) */
1559
1560         /* first look for the IBM SCSI integrated subsystem on the motherboard */
1561         for (j = 0; j < 8; j++) /* read the pos-information */
1562                 pos[j] = mca_read_stored_pos(MCA_INTEGSCSI, j);
1563         /* pos2 = pos3 = 0xff if there is no integrated SCSI-subsystem present, but
1564          * if we ignore the settings of all surrounding pos registers, it is not
1565          * completely sufficient to only check pos2 and pos3. */
1566         /* Therefore, now the following if statement is used to
1567          * make sure, we see a real integrated onboard SCSI-interface and no
1568          * internal system information, which gets mapped to some pos registers
1569          * on models 95xx. */
1570         if ((!pos[0] && !pos[1] && pos[2] > 0 && pos[3] > 0 && !pos[4] && !pos[5] && !pos[6] && !pos[7]) || (pos[0] == 0xff && pos[1] == 0xff && pos[2] < 0xff && pos[3] < 0xff && pos[4] == 0xff && pos[5] == 0xff && pos[6] == 0xff && pos[7] == 0xff)) {
1571                 if ((pos[2] & 1) == 1)  /* is the subsystem chip enabled ? */
1572                         port = IM_IO_PORT;
1573                 else {          /* if disabled, no IRQs will be generated, as the chip won't
1574                                  * listen to the incoming commands and will do really nothing,
1575                                  * except for listening to the pos-register settings. If this
1576                                  * happens, I need to hugely think about it, as one has to
1577                                  * write something to the MCA-Bus pos register in order to
1578                                  * enable the chip. Normally, IBM-SCSI won't pass the POST,
1579                                  * when the chip is disabled (see IBM tech. ref.). */
1580                         port = IM_IO_PORT;      /* anyway, set the portnumber and warn */
1581                         printk("IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n" "              SCSI-operations may not work.\n");
1582                 }
1583                 id = (pos[3] & 0xe0) >> 5;      /* this is correct and represents the PUN */
1584                 /* give detailed information on the subsystem. This helps me
1585                  * additionally during debugging and analyzing bug-reports. */
1586                 printk(KERN_INFO "IBM MCA SCSI: IBM Integrated SCSI Controller ffound, io=0x%x, scsi id=%d,\n", port, id);
1587                 printk(KERN_INFO "              chip rev.=%d, 8K NVRAM=%s, subsystem=%s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 2) ? "locked" : "accessible", (pos[2] & 1) ? "enabled." : "disabled.");
1588
1589                 /* register the found integrated SCSI-subsystem */
1590                 if ((shpnt = ibmmca_register(scsi_template, port, id, INTEGRATED_SCSI, "IBM Integrated SCSI Controller")))
1591                 {
1592                         for (k = 2; k < 7; k++)
1593                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
1594                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = INTEGRATED_SCSI;
1595                         mca_set_adapter_name(MCA_INTEGSCSI, "IBM Integrated SCSI Controller");
1596                         mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1597                         mca_mark_as_used(MCA_INTEGSCSI);
1598                         devices_on_irq_14++;
1599                 }
1600         }
1601
1602         /* now look for other adapters in MCA slots, */
1603         /* determine the number of known IBM-SCSI-subsystem types */
1604         /* see the pos[2] dependence to get the adapter port-offset. */
1605         for (i = 0; i < ARRAY_SIZE(subsys_list); i++) {
1606                 /* scan each slot for a fitting adapter id */
1607                 slot = 0;       /* start at slot 0 */
1608                 while ((slot = mca_find_adapter(subsys_list[i].mca_id, slot))
1609                        != MCA_NOTFOUND) {       /* scan through all slots */
1610                         for (j = 0; j < 8; j++) /* read the pos-information */
1611                                 pos[j] = mca_read_stored_pos(slot, j);
1612                         if ((pos[2] & 1) == 1)
1613                                 /* is the subsystem chip enabled ? */
1614                                 /* (explanations see above) */
1615                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1616                         else {
1617                                 /* anyway, set the portnumber and warn */
1618                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1619                                 printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
1620                                 printk(KERN_WARNING "              SCSI-operations may not work.\n");
1621                         }
1622                         if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
1623                                 printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
1624                                 printk(KERN_ERR "              Impossible to determine adapter PUN!\n");
1625                                 printk(KERN_ERR "              Guessing adapter PUN = 7.\n");
1626                                 id = 7;
1627                         } else {
1628                                 id = (pos[3] & 0xe0) >> 5;      /* get subsystem PUN */
1629                                 if (i == IBM_SCSI2_FW) {
1630                                         id |= (pos[3] & 0x10) >> 1;     /* get subsystem PUN high-bit
1631                                                                          * for F/W adapters */
1632                                 }
1633                         }
1634                         if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
1635                                 /* IRQ11 is used by SCSI-2 F/W Adapter/A */
1636                                 printk(KERN_DEBUG "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
1637                                 /* get interrupt request level */
1638                                 if (request_irq(IM_IRQ_FW, interrupt_handler, IRQF_SHARED, "ibmmcascsi", hosts)) {
1639                                         printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
1640                                 } else
1641                                         IRQ11_registered++;
1642                         }
1643                         printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
1644                         if ((pos[2] & 0xf0) == 0xf0)
1645                                 printk(KERN_DEBUG"              ROM Addr.=off,");
1646                         else
1647                                 printk(KERN_DEBUG "              ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
1648                         printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");
1649
1650                         /* register the hostadapter */
1651                         if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
1652                                 for (k = 2; k < 8; k++)
1653                                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
1654                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
1655                                 mca_set_adapter_name(slot, subsys_list[i].description);
1656                                 mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1657                                 mca_mark_as_used(slot);
1658                                 if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
1659                                         devices_on_irq_11++;
1660                                 else
1661                                         devices_on_irq_14++;
1662                         }
1663                         slot++; /* advance to next slot */
1664                 }               /* advance to next adapter id in the list of IBM-SCSI-subsystems */
1665         }
1666
1667         /* now check for SCSI-adapters, mapped to the integrated SCSI
1668          * area. E.g. a W/Cache in MCA-slot 9(!). Do the check correct here,
1669          * as this is a known effect on some models 95xx. */
1670         for (i = 0; i < ARRAY_SIZE(subsys_list); i++) {
1671                 /* scan each slot for a fitting adapter id */
1672                 slot = mca_find_adapter(subsys_list[i].mca_id, MCA_INTEGSCSI);
1673                 if (slot != MCA_NOTFOUND) {     /* scan through all slots */
1674                         for (j = 0; j < 8; j++) /* read the pos-information */
1675                                 pos[j] = mca_read_stored_pos(slot, j);
1676                         if ((pos[2] & 1) == 1) {        /* is the subsystem chip enabled ? */
1677                                 /* (explanations see above) */
1678                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1679                         } else {        /* anyway, set the portnumber and warn */
1680                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1681                                 printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
1682                                 printk(KERN_WARNING "              SCSI-operations may not work.\n");
1683                         }
1684                         if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
1685                                 printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
1686                                 printk(KERN_ERR  "              Impossible to determine adapter PUN!\n");
1687                                 printk(KERN_ERR "              Guessing adapter PUN = 7.\n");
1688                                 id = 7;
1689                         } else {
1690                                 id = (pos[3] & 0xe0) >> 5;      /* get subsystem PUN */
1691                                 if (i == IBM_SCSI2_FW)
1692                                         id |= (pos[3] & 0x10) >> 1;     /* get subsystem PUN high-bit
1693                                                                          * for F/W adapters */
1694                         }
1695                         if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
1696                                 /* IRQ11 is used by SCSI-2 F/W Adapter/A */
1697                                 printk(KERN_DEBUG  "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
1698                                 /* get interrupt request level */
1699                                 if (request_irq(IM_IRQ_FW, interrupt_handler, IRQF_SHARED, "ibmmcascsi", hosts))
1700                                         printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
1701                                 else
1702                                         IRQ11_registered++;
1703                         }
1704                         printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
1705                         if ((pos[2] & 0xf0) == 0xf0)
1706                                 printk(KERN_DEBUG "              ROM Addr.=off,");
1707                         else
1708                                 printk(KERN_DEBUG "              ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
1709                         printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");
1710
1711                         /* register the hostadapter */
1712                         if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
1713                                 for (k = 2; k < 7; k++)
1714                                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
1715                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
1716                                 mca_set_adapter_name(slot, subsys_list[i].description);
1717                                 mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1718                                 mca_mark_as_used(slot);
1719                                 if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
1720                                         devices_on_irq_11++;
1721                                 else
1722                                         devices_on_irq_14++;
1723                         }
1724                         slot++; /* advance to next slot */
1725                 }               /* advance to next adapter id in the list of IBM-SCSI-subsystems */
1726         }
1727         if (IRQ11_registered && !devices_on_irq_11)
1728                 free_irq(IM_IRQ_FW, hosts);     /* no devices on IRQ 11 */
1729         if (IRQ14_registered && !devices_on_irq_14)
1730                 free_irq(IM_IRQ, hosts);        /* no devices on IRQ 14 */
1731         if (!devices_on_irq_11 && !devices_on_irq_14)
1732                 printk(KERN_WARNING "IBM MCA SCSI: No IBM SCSI-subsystem adapter attached.\n");
1733         return found;           /* return the number of found SCSI hosts. Should be 1 or 0. */
1734 }
1735
1736 static struct Scsi_Host *ibmmca_register(struct scsi_host_template * scsi_template, int port, int id, int adaptertype, char *hostname)
1737 {
1738         struct Scsi_Host *shpnt;
1739         int i, j;
1740         unsigned int ctrl;
1741
1742         /* check I/O region */
1743         if (!request_region(port, IM_N_IO_PORT, hostname)) {
1744                 printk(KERN_ERR "IBM MCA SCSI: Unable to get I/O region 0x%x-0x%x (%d ports).\n", port, port + IM_N_IO_PORT - 1, IM_N_IO_PORT);
1745                 return NULL;
1746         }
1747
1748         /* register host */
1749         shpnt = scsi_register(scsi_template, sizeof(struct ibmmca_hostdata));
1750         if (!shpnt) {
1751                 printk(KERN_ERR "IBM MCA SCSI: Unable to register host.\n");
1752                 release_region(port, IM_N_IO_PORT);
1753                 return NULL;
1754         }
1755
1756         /* request I/O region */
1757         hosts[found] = shpnt;   /* add new found hostadapter to the list */
1758         special(found) = adaptertype;   /* important assignment or else crash! */
1759         subsystem_connector_size(found) = 0;    /* preset slot-size */
1760         shpnt->irq = IM_IRQ;    /* assign necessary stuff for the adapter */
1761         shpnt->io_port = port;
1762         shpnt->n_io_port = IM_N_IO_PORT;
1763         shpnt->this_id = id;
1764         shpnt->max_id = 8;      /* 8 PUNs are default */
1765         /* now, the SCSI-subsystem is connected to Linux */
1766
1767         ctrl = (unsigned int) (inb(IM_CTR_REG(found))); /* get control-register status */
1768 #ifdef IM_DEBUG_PROBE
1769         printk("IBM MCA SCSI: Control Register contents: %x, status: %x\n", ctrl, inb(IM_STAT_REG(found)));
1770         printk("IBM MCA SCSI: This adapters' POS-registers: ");
1771         for (i = 0; i < 8; i++)
1772                 printk("%x ", pos[i]);
1773         printk("\n");
1774 #endif
1775         reset_status(found) = IM_RESET_NOT_IN_PROGRESS;
1776
1777         for (i = 0; i < 16; i++)        /* reset the tables */
1778                 for (j = 0; j < 8; j++)
1779                         get_ldn(found)[i][j] = MAX_LOG_DEV;
1780
1781         /* check which logical devices exist */
1782         /* after this line, local interrupting is possible: */
1783         local_checking_phase_flag(found) = 1;
1784         check_devices(found, adaptertype);      /* call by value, using the global variable hosts */
1785         local_checking_phase_flag(found) = 0;
1786         found++;                /* now increase index to be prepared for next found subsystem */
1787         /* an ibm mca subsystem has been detected */
1788         return shpnt;
1789 }
1790
1791 static int ibmmca_release(struct Scsi_Host *shpnt)
1792 {
1793         release_region(shpnt->io_port, shpnt->n_io_port);
1794         if (!(--found))
1795                 free_irq(shpnt->irq, hosts);
1796         return 0;
1797 }
1798
1799 /* The following routine is the SCSI command queue for the midlevel driver */
1800 static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
1801 {
1802         unsigned int ldn;
1803         unsigned int scsi_cmd;
1804         struct im_scb *scb;
1805         struct Scsi_Host *shpnt;
1806         int current_ldn;
1807         int id, lun;
1808         int target;
1809         int host_index;
1810         int max_pun;
1811         int i;
1812         struct scatterlist *sl;
1813
1814         shpnt = cmd->device->host;
1815         /* search for the right hostadapter */
1816         for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
1817
1818         if (!hosts[host_index]) {       /* invalid hostadapter descriptor address */
1819                 cmd->result = DID_NO_CONNECT << 16;
1820                 if (done)
1821                         done(cmd);
1822                 return 0;
1823         }
1824         max_pun = subsystem_maxid(host_index);
1825         if (ibm_ansi_order) {
1826                 target = max_pun - 1 - cmd->device->id;
1827                 if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
1828                         target--;
1829                 else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
1830                         target++;
1831         } else
1832                 target = cmd->device->id;
1833
1834         /* if (target,lun) is NO LUN or not existing at all, return error */
1835         if ((get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_LUN) || (get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_DEVICE)) {
1836                 cmd->result = DID_NO_CONNECT << 16;
1837                 if (done)
1838                         done(cmd);
1839                 return 0;
1840         }
1841
1842         /*if (target,lun) unassigned, do further checks... */
1843         ldn = get_ldn(host_index)[target][cmd->device->lun];
1844         if (ldn >= MAX_LOG_DEV) {       /* on invalid ldn do special stuff */
1845                 if (ldn > MAX_LOG_DEV) {        /* dynamical remapping if ldn unassigned */
1846                         current_ldn = next_ldn(host_index);     /* stop-value for one circle */
1847                         while (ld(host_index)[next_ldn(host_index)].cmd) {      /* search for a occupied, but not in */
1848                                 /* command-processing ldn. */
1849                                 next_ldn(host_index)++;
1850                                 if (next_ldn(host_index) >= MAX_LOG_DEV)
1851                                         next_ldn(host_index) = 7;
1852                                 if (current_ldn == next_ldn(host_index)) {      /* One circle done ? */
1853                                         /* no non-processing ldn found */
1854                                         scmd_printk(KERN_WARNING, cmd,
1855         "IBM MCA SCSI: Cannot assign SCSI-device dynamically!\n"
1856         "              On ldn 7-14 SCSI-commands everywhere in progress.\n"
1857         "              Reporting DID_NO_CONNECT for device.\n");
1858                                         cmd->result = DID_NO_CONNECT << 16;     /* return no connect */
1859                                         if (done)
1860                                                 done(cmd);
1861                                         return 0;
1862                                 }
1863                         }
1864
1865                         /* unmap non-processing ldn */
1866                         for (id = 0; id < max_pun; id++)
1867                                 for (lun = 0; lun < 8; lun++) {
1868                                         if (get_ldn(host_index)[id][lun] == next_ldn(host_index)) {
1869                                                 get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
1870                                                 get_scsi(host_index)[id][lun] = TYPE_NO_DEVICE;
1871                                                 /* unmap entry */
1872                                         }
1873                                 }
1874                         /* set reduced interrupt_handler-mode for checking */
1875                         local_checking_phase_flag(host_index) = 1;
1876                         /* map found ldn to pun,lun */
1877                         get_ldn(host_index)[target][cmd->device->lun] = next_ldn(host_index);
1878                         /* change ldn to the right value, that is now next_ldn */
1879                         ldn = next_ldn(host_index);
1880                         /* unassign all ldns (pun,lun,ldn does not matter for remove) */
1881                         immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
1882                         /* set only LDN for remapped device */
1883                         immediate_assign(host_index, target, cmd->device->lun, ldn, SET_LDN);
1884                         /* get device information for ld[ldn] */
1885                         if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
1886                                 ld(host_index)[ldn].cmd = NULL; /* To prevent panic set 0, because
1887                                                                    devices that were not assigned,
1888                                                                    should have nothing in progress. */
1889                                 get_scsi(host_index)[target][cmd->device->lun] = ld(host_index)[ldn].device_type;
1890                                 /* increase assignment counters for statistics in /proc */
1891                                 IBM_DS(host_index).dynamical_assignments++;
1892                                 IBM_DS(host_index).ldn_assignments[ldn]++;
1893                         } else
1894                                 /* panic here, because a device, found at boottime has
1895                                    vanished */
1896                                 panic("IBM MCA SCSI: ldn=0x%x, SCSI-device on (%d,%d) vanished!\n", ldn, target, cmd->device->lun);
1897                         /* unassign again all ldns (pun,lun,ldn does not matter for remove) */
1898                         immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
1899                         /* remap all ldns, as written in the pun/lun table */
1900                         lun = 0;
1901 #ifdef CONFIG_SCSI_MULTI_LUN
1902                         for (lun = 0; lun < 8; lun++)
1903 #endif
1904                                 for (id = 0; id < max_pun; id++) {
1905                                         if (get_ldn(host_index)[id][lun] <= MAX_LOG_DEV)
1906                                                 immediate_assign(host_index, id, lun, get_ldn(host_index)[id][lun], SET_LDN);
1907                                 }
1908                         /* set back to normal interrupt_handling */
1909                         local_checking_phase_flag(host_index) = 0;
1910 #ifdef IM_DEBUG_PROBE
1911                         /* Information on syslog terminal */
1912                         printk("IBM MCA SCSI: ldn=0x%x dynamically reassigned to (%d,%d).\n", ldn, target, cmd->device->lun);
1913 #endif
1914                         /* increase next_ldn for next dynamical assignment */
1915                         next_ldn(host_index)++;
1916                         if (next_ldn(host_index) >= MAX_LOG_DEV)
1917                                 next_ldn(host_index) = 7;
1918                 } else {        /* wall against Linux accesses to the subsystem adapter */
1919                         cmd->result = DID_BAD_TARGET << 16;
1920                         if (done)
1921                                 done(cmd);
1922                         return 0;
1923                 }
1924         }
1925
1926         /*verify there is no command already in progress for this log dev */
1927         if (ld(host_index)[ldn].cmd)
1928                 panic("IBM MCA SCSI: cmd already in progress for this ldn.\n");
1929
1930         /*save done in cmd, and save cmd for the interrupt handler */
1931         cmd->scsi_done = done;
1932         ld(host_index)[ldn].cmd = cmd;
1933
1934         /*fill scb information independent of the scsi command */
1935         scb = &(ld(host_index)[ldn].scb);
1936         ld(host_index)[ldn].tsb.dev_status = 0;
1937         scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE;
1938         scb->tsb_adr = isa_virt_to_bus(&(ld(host_index)[ldn].tsb));
1939         scsi_cmd = cmd->cmnd[0];
1940
1941         if (cmd->use_sg) {
1942                 i = cmd->use_sg;
1943                 sl = (struct scatterlist *) (cmd->request_buffer);
1944                 if (i > 16)
1945                         panic("IBM MCA SCSI: scatter-gather list too long.\n");
1946                 while (--i >= 0) {
1947                         ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sl[i].page) + sl[i].offset);
1948                         ld(host_index)[ldn].sge[i].byte_length = sl[i].length;
1949                 }
1950                 scb->enable |= IM_POINTER_TO_LIST;
1951                 scb->sys_buf_adr = isa_virt_to_bus(&(ld(host_index)[ldn].sge[0]));
1952                 scb->sys_buf_length = cmd->use_sg * sizeof(struct im_sge);
1953         } else {
1954                 scb->sys_buf_adr = isa_virt_to_bus(cmd->request_buffer);
1955                 /* recent Linux midlevel SCSI places 1024 byte for inquiry
1956                  * command. Far too much for old PS/2 hardware. */
1957                 switch (scsi_cmd) {
1958                         /* avoid command errors by setting bufferlengths to
1959                          * ANSI-standard. Beware of forcing it to 255,
1960                          * this could SEGV the kernel!!! */
1961                 case INQUIRY:
1962                 case REQUEST_SENSE:
1963                 case MODE_SENSE:
1964                 case MODE_SELECT:
1965                         if (cmd->request_bufflen > 255)
1966                                 scb->sys_buf_length = 255;
1967                         else
1968                                 scb->sys_buf_length = cmd->request_bufflen;
1969                         break;
1970                 case TEST_UNIT_READY:
1971                         scb->sys_buf_length = 0;
1972                         break;
1973                 default:
1974                         scb->sys_buf_length = cmd->request_bufflen;
1975                         break;
1976                 }
1977         }
1978         /*fill scb information dependent on scsi command */
1979
1980 #ifdef IM_DEBUG_CMD
1981         printk("issue scsi cmd=%02x to ldn=%d\n", scsi_cmd, ldn);
1982 #endif
1983
1984         /* for specific device-type debugging: */
1985 #ifdef IM_DEBUG_CMD_SPEC_DEV
1986         if (ld(host_index)[ldn].device_type == IM_DEBUG_CMD_DEVICE)
1987                 printk("(SCSI-device-type=0x%x) issue scsi cmd=%02x to ldn=%d\n", ld(host_index)[ldn].device_type, scsi_cmd, ldn);
1988 #endif
1989
1990         /* for possible panics store current command */
1991         last_scsi_command(host_index)[ldn] = scsi_cmd;
1992         last_scsi_type(host_index)[ldn] = IM_SCB;
1993         /* update statistical info */
1994         IBM_DS(host_index).total_accesses++;
1995         IBM_DS(host_index).ldn_access[ldn]++;
1996
1997         switch (scsi_cmd) {
1998         case READ_6:
1999         case WRITE_6:
2000         case READ_10:
2001         case WRITE_10:
2002         case READ_12:
2003         case WRITE_12:
2004                 /* Distinguish between disk and other devices. Only disks (that are the
2005                    most frequently accessed devices) should be supported by the
2006                    IBM-SCSI-Subsystem commands. */
2007                 switch (ld(host_index)[ldn].device_type) {
2008                 case TYPE_DISK: /* for harddisks enter here ... */
2009                 case TYPE_MOD:  /* ... try it also for MO-drives (send flames as */
2010                         /*     you like, if this won't work.) */
2011                         if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12) {
2012                                 /* read command preparations */
2013                                 scb->enable |= IM_READ_CONTROL;
2014                                 IBM_DS(host_index).ldn_read_access[ldn]++;      /* increase READ-access on ldn stat. */
2015                                 scb->command = IM_READ_DATA_CMD | IM_NO_DISCONNECT;
2016                         } else {        /* write command preparations */
2017                                 IBM_DS(host_index).ldn_write_access[ldn]++;     /* increase write-count on ldn stat. */
2018                                 scb->command = IM_WRITE_DATA_CMD | IM_NO_DISCONNECT;
2019                         }
2020                         if (scsi_cmd == READ_6 || scsi_cmd == WRITE_6) {
2021                                 scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[3]) << 0) | (((unsigned) cmd->cmnd[2]) << 8) | ((((unsigned) cmd->cmnd[1]) & 0x1f) << 16);
2022                                 scb->u2.blk.count = (unsigned) cmd->cmnd[4];
2023                         } else {
2024                                 scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[5]) << 0) | (((unsigned) cmd->cmnd[4]) << 8) | (((unsigned) cmd->cmnd[3]) << 16) | (((unsigned) cmd->cmnd[2]) << 24);
2025                                 scb->u2.blk.count = (((unsigned) cmd->cmnd[8]) << 0) | (((unsigned) cmd->cmnd[7]) << 8);
2026                         }
2027                         last_scsi_logical_block(host_index)[ldn] = scb->u1.log_blk_adr;
2028                         last_scsi_blockcount(host_index)[ldn] = scb->u2.blk.count;
2029                         scb->u2.blk.length = ld(host_index)[ldn].block_length;
2030                         break;
2031                         /* for other devices, enter here. Other types are not known by
2032                            Linux! TYPE_NO_LUN is forbidden as valid device. */
2033                 case TYPE_ROM:
2034                 case TYPE_TAPE:
2035                 case TYPE_PROCESSOR:
2036                 case TYPE_WORM:
2037                 case TYPE_SCANNER:
2038                 case TYPE_MEDIUM_CHANGER:
2039                         /* If there is a sequential-device, IBM recommends to use
2040                            IM_OTHER_SCSI_CMD_CMD instead of subsystem READ/WRITE.
2041                            This includes CD-ROM devices, too, due to the partial sequential
2042                            read capabilities. */
2043                         scb->command = IM_OTHER_SCSI_CMD_CMD;
2044                         if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12)
2045                                 /* enable READ */
2046                                 scb->enable |= IM_READ_CONTROL;
2047                         scb->enable |= IM_BYPASS_BUFFER;
2048                         scb->u1.scsi_cmd_length = cmd->cmd_len;
2049                         memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
2050                         last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2051                         /* Read/write on this non-disk devices is also displayworthy,
2052                            so flash-up the LED/display. */
2053                         break;
2054                 }
2055                 break;
2056         case INQUIRY:
2057                 IBM_DS(host_index).ldn_inquiry_access[ldn]++;
2058                 scb->command = IM_DEVICE_INQUIRY_CMD;
2059                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2060                 scb->u1.log_blk_adr = 0;
2061                 break;
2062         case TEST_UNIT_READY:
2063                 scb->command = IM_OTHER_SCSI_CMD_CMD;
2064                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2065                 scb->u1.log_blk_adr = 0;
2066                 scb->u1.scsi_cmd_length = 6;
2067                 memcpy(scb->u2.scsi_command, cmd->cmnd, 6);
2068                 last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2069                 break;
2070         case READ_CAPACITY:
2071                 /* the length of system memory buffer must be exactly 8 bytes */
2072                 scb->command = IM_READ_CAPACITY_CMD;
2073                 scb->enable |= IM_READ_CONTROL | IM_BYPASS_BUFFER;
2074                 if (scb->sys_buf_length > 8)
2075                         scb->sys_buf_length = 8;
2076                 break;
2077                 /* Commands that need read-only-mode (system <- device): */
2078         case REQUEST_SENSE:
2079                 scb->command = IM_REQUEST_SENSE_CMD;
2080                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2081                 break;
2082                 /* Commands that need write-only-mode (system -> device): */
2083         case MODE_SELECT:
2084         case MODE_SELECT_10:
2085                 IBM_DS(host_index).ldn_modeselect_access[ldn]++;
2086                 scb->command = IM_OTHER_SCSI_CMD_CMD;
2087                 scb->enable |= IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;   /*Select needs WRITE-enabled */
2088                 scb->u1.scsi_cmd_length = cmd->cmd_len;
2089                 memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
2090                 last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2091                 break;
2092                 /* For other commands, read-only is useful. Most other commands are
2093                    running without an input-data-block. */
2094         default:
2095                 scb->command = IM_OTHER_SCSI_CMD_CMD;
2096                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2097                 scb->u1.scsi_cmd_length = cmd->cmd_len;
2098                 memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
2099                 last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2100                 break;
2101         }
2102         /*issue scb command, and return */
2103         if (++disk_rw_in_progress == 1)
2104                 PS2_DISK_LED_ON(shpnt->host_no, target);
2105
2106         if (last_scsi_type(host_index)[ldn] == IM_LONG_SCB) {
2107                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_LONG_SCB | ldn);
2108                 IBM_DS(host_index).long_scbs++;
2109         } else {
2110                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
2111                 IBM_DS(host_index).scbs++;
2112         }
2113         return 0;
2114 }
2115
2116 static int __ibmmca_abort(Scsi_Cmnd * cmd)
2117 {
2118         /* Abort does not work, as the adapter never generates an interrupt on
2119          * whatever situation is simulated, even when really pending commands
2120          * are running on the adapters' hardware ! */
2121
2122         struct Scsi_Host *shpnt;
2123         unsigned int ldn;
2124         void (*saved_done) (Scsi_Cmnd *);
2125         int target;
2126         int host_index;
2127         int max_pun;
2128         unsigned long imm_command;
2129
2130 #ifdef IM_DEBUG_PROBE
2131         printk("IBM MCA SCSI: Abort subroutine called...\n");
2132 #endif
2133
2134         shpnt = cmd->device->host;
2135         /* search for the right hostadapter */
2136         for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
2137
2138         if (!hosts[host_index]) {       /* invalid hostadapter descriptor address */
2139                 cmd->result = DID_NO_CONNECT << 16;
2140                 if (cmd->scsi_done)
2141                         (cmd->scsi_done) (cmd);
2142                 shpnt = cmd->device->host;
2143 #ifdef IM_DEBUG_PROBE
2144                 printk(KERN_DEBUG "IBM MCA SCSI: Abort adapter selection failed!\n");
2145 #endif
2146                 return SUCCESS;
2147         }
2148         max_pun = subsystem_maxid(host_index);
2149         if (ibm_ansi_order) {
2150                 target = max_pun - 1 - cmd->device->id;
2151                 if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
2152                         target--;
2153                 else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
2154                         target++;
2155         } else
2156                 target = cmd->device->id;
2157
2158         /* get logical device number, and disable system interrupts */
2159         printk(KERN_WARNING "IBM MCA SCSI: Sending abort to device pun=%d, lun=%d.\n", target, cmd->device->lun);
2160         ldn = get_ldn(host_index)[target][cmd->device->lun];
2161
2162         /*if cmd for this ldn has already finished, no need to abort */
2163         if (!ld(host_index)[ldn].cmd) {
2164                     return SUCCESS;
2165         }
2166
2167         /* Clear ld.cmd, save done function, install internal done,
2168          * send abort immediate command (this enables sys. interrupts),
2169          * and wait until the interrupt arrives.
2170          */
2171         saved_done = cmd->scsi_done;
2172         cmd->scsi_done = internal_done;
2173         cmd->SCp.Status = 0;
2174         last_scsi_command(host_index)[ldn] = IM_ABORT_IMM_CMD;
2175         last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
2176         imm_command = inl(IM_CMD_REG(host_index));
2177         imm_command &= (unsigned long) (0xffff0000);    /* mask reserved stuff */
2178         imm_command |= (unsigned long) (IM_ABORT_IMM_CMD);
2179         /* must wait for attention reg not busy */
2180         /* FIXME - timeout, politeness */
2181         while (1) {
2182                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
2183                         break;
2184         }
2185         /* write registers and enable system interrupts */
2186         outl(imm_command, IM_CMD_REG(host_index));
2187         outb(IM_IMM_CMD | ldn, IM_ATTN_REG(host_index));
2188 #ifdef IM_DEBUG_PROBE
2189         printk("IBM MCA SCSI: Abort queued to adapter...\n");
2190 #endif
2191         spin_unlock_irq(shpnt->host_lock);
2192         while (!cmd->SCp.Status)
2193                 yield();
2194         spin_lock_irq(shpnt->host_lock);
2195         cmd->scsi_done = saved_done;
2196 #ifdef IM_DEBUG_PROBE
2197         printk("IBM MCA SCSI: Abort returned with adapter response...\n");
2198 #endif
2199
2200         /*if abort went well, call saved done, then return success or error */
2201         if (cmd->result == (DID_ABORT << 16))
2202         {
2203                 cmd->result |= DID_ABORT << 16;
2204                 if (cmd->scsi_done)
2205                         (cmd->scsi_done) (cmd);
2206                 ld(host_index)[ldn].cmd = NULL;
2207 #ifdef IM_DEBUG_PROBE
2208                 printk("IBM MCA SCSI: Abort finished with success.\n");
2209 #endif
2210                 return SUCCESS;
2211         } else {
2212                 cmd->result |= DID_NO_CONNECT << 16;
2213                 if (cmd->scsi_done)
2214                         (cmd->scsi_done) (cmd);
2215                 ld(host_index)[ldn].cmd = NULL;
2216 #ifdef IM_DEBUG_PROBE
2217                 printk("IBM MCA SCSI: Abort failed.\n");
2218 #endif
2219                 return FAILED;
2220         }
2221 }
2222
2223 static int ibmmca_abort(Scsi_Cmnd * cmd)
2224 {
2225         struct Scsi_Host *shpnt = cmd->device->host;
2226         int rc;
2227
2228         spin_lock_irq(shpnt->host_lock);
2229         rc = __ibmmca_abort(cmd);
2230         spin_unlock_irq(shpnt->host_lock);
2231
2232         return rc;
2233 }
2234
2235 static int __ibmmca_host_reset(Scsi_Cmnd * cmd)
2236 {
2237         struct Scsi_Host *shpnt;
2238         Scsi_Cmnd *cmd_aid;
2239         int ticks, i;
2240         int host_index;
2241         unsigned long imm_command;
2242
2243         BUG_ON(cmd == NULL);
2244
2245         ticks = IM_RESET_DELAY * HZ;
2246         shpnt = cmd->device->host;
2247         /* search for the right hostadapter */
2248         for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
2249
2250         if (!hosts[host_index]) /* invalid hostadapter descriptor address */
2251                 return FAILED;
2252
2253         if (local_checking_phase_flag(host_index)) {
2254                 printk(KERN_WARNING "IBM MCA SCSI: unable to reset while checking devices.\n");
2255                 return FAILED;
2256         }
2257
2258         /* issue reset immediate command to subsystem, and wait for interrupt */
2259         printk("IBM MCA SCSI: resetting all devices.\n");
2260         reset_status(host_index) = IM_RESET_IN_PROGRESS;
2261         last_scsi_command(host_index)[0xf] = IM_RESET_IMM_CMD;
2262         last_scsi_type(host_index)[0xf] = IM_IMM_CMD;
2263         imm_command = inl(IM_CMD_REG(host_index));
2264         imm_command &= (unsigned long) (0xffff0000);    /* mask reserved stuff */
2265         imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
2266         /* must wait for attention reg not busy */
2267         while (1) {
2268                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
2269                         break;
2270                 spin_unlock_irq(shpnt->host_lock);
2271                 yield();
2272                 spin_lock_irq(shpnt->host_lock);
2273         }
2274         /*write registers and enable system interrupts */
2275         outl(imm_command, IM_CMD_REG(host_index));
2276         outb(IM_IMM_CMD | 0xf, IM_ATTN_REG(host_index));
2277         /* wait for interrupt finished or intr_stat register to be set, as the
2278          * interrupt will not be executed, while we are in here! */
2279
2280         /* FIXME: This is really really icky we so want a sleeping version of this ! */
2281         while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks && ((inb(IM_INTR_REG(host_index)) & 0x8f) != 0x8f)) {
2282                 udelay((1 + 999 / HZ) * 1000);
2283                 barrier();
2284         }
2285         /* if reset did not complete, just return an error */
2286         if (!ticks) {
2287                 printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
2288                 reset_status(host_index) = IM_RESET_FINISHED_FAIL;
2289                 return FAILED;
2290         }
2291
2292         if ((inb(IM_INTR_REG(host_index)) & 0x8f) == 0x8f) {
2293                 /* analysis done by this routine and not by the intr-routine */
2294                 if (inb(IM_INTR_REG(host_index)) == 0xaf)
2295                         reset_status(host_index) = IM_RESET_FINISHED_OK_NO_INT;
2296                 else if (inb(IM_INTR_REG(host_index)) == 0xcf)
2297                         reset_status(host_index) = IM_RESET_FINISHED_FAIL;
2298                 else            /* failed, 4get it */
2299                         reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS_NO_INT;
2300                 outb(IM_EOI | 0xf, IM_ATTN_REG(host_index));
2301         }
2302
2303         /* if reset failed, just return an error */
2304         if (reset_status(host_index) == IM_RESET_FINISHED_FAIL) {
2305                 printk(KERN_ERR "IBM MCA SCSI: reset failed.\n");
2306                 return FAILED;
2307         }
2308
2309         /* so reset finished ok - call outstanding done's, and return success */
2310         printk(KERN_INFO "IBM MCA SCSI: Reset successfully completed.\n");
2311         for (i = 0; i < MAX_LOG_DEV; i++) {
2312                 cmd_aid = ld(host_index)[i].cmd;
2313                 if (cmd_aid && cmd_aid->scsi_done) {
2314                         ld(host_index)[i].cmd = NULL;
2315                         cmd_aid->result = DID_RESET << 16;
2316                 }
2317         }
2318         return SUCCESS;
2319 }
2320
2321 static int ibmmca_host_reset(Scsi_Cmnd * cmd)
2322 {
2323         struct Scsi_Host *shpnt = cmd->device->host;
2324         int rc;
2325
2326         spin_lock_irq(shpnt->host_lock);
2327         rc = __ibmmca_host_reset(cmd);
2328         spin_unlock_irq(shpnt->host_lock);
2329
2330         return rc;
2331 }
2332
2333 static int ibmmca_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *info)
2334 {
2335         int size = capacity;
2336         info[0] = 64;
2337         info[1] = 32;
2338         info[2] = size / (info[0] * info[1]);
2339         if (info[2] >= 1024) {
2340                 info[0] = 128;
2341                 info[1] = 63;
2342                 info[2] = size / (info[0] * info[1]);
2343                 if (info[2] >= 1024) {
2344                         info[0] = 255;
2345                         info[1] = 63;
2346                         info[2] = size / (info[0] * info[1]);
2347                         if (info[2] >= 1024)
2348                                 info[2] = 1023;
2349                 }
2350         }
2351         return 0;
2352 }
2353
2354 /* calculate percentage of total accesses on a ldn */
2355 static int ldn_access_load(int host_index, int ldn)
2356 {
2357         if (IBM_DS(host_index).total_accesses == 0)
2358                 return (0);
2359         if (IBM_DS(host_index).ldn_access[ldn] == 0)
2360                 return (0);
2361         return (IBM_DS(host_index).ldn_access[ldn] * 100) / IBM_DS(host_index).total_accesses;
2362 }
2363
2364 /* calculate total amount of r/w-accesses */
2365 static int ldn_access_total_read_write(int host_index)
2366 {
2367         int a;
2368         int i;
2369
2370         a = 0;
2371         for (i = 0; i <= MAX_LOG_DEV; i++)
2372                 a += IBM_DS(host_index).ldn_read_access[i] + IBM_DS(host_index).ldn_write_access[i];
2373         return (a);
2374 }
2375
2376 static int ldn_access_total_inquiry(int host_index)
2377 {
2378         int a;
2379         int i;
2380
2381         a = 0;
2382         for (i = 0; i <= MAX_LOG_DEV; i++)
2383                 a += IBM_DS(host_index).ldn_inquiry_access[i];
2384         return (a);
2385 }
2386
2387 static int ldn_access_total_modeselect(int host_index)
2388 {
2389         int a;
2390         int i;
2391
2392         a = 0;
2393         for (i = 0; i <= MAX_LOG_DEV; i++)
2394                 a += IBM_DS(host_index).ldn_modeselect_access[i];
2395         return (a);
2396 }
2397
2398 /* routine to display info in the proc-fs-structure (a deluxe feature) */
2399 static int ibmmca_proc_info(struct Scsi_Host *shpnt, char *buffer, char **start, off_t offset, int length, int inout)
2400 {
2401         int len = 0;
2402         int i, id, lun, host_index;
2403         unsigned long flags;
2404         int max_pun;
2405
2406         for (i = 0; hosts[i] && hosts[i] != shpnt; i++);
2407
2408         spin_lock_irqsave(hosts[i]->host_lock, flags);  /* Check it */
2409         host_index = i;
2410         if (!shpnt) {
2411                 len += sprintf(buffer + len, "\nIBM MCA SCSI: Can't find adapter");
2412                 return len;
2413         }
2414         max_pun = subsystem_maxid(host_index);
2415
2416         len += sprintf(buffer + len, "\n             IBM-SCSI-Subsystem-Linux-Driver, Version %s\n\n\n", IBMMCA_SCSI_DRIVER_VERSION);
2417         len += sprintf(buffer + len, " SCSI Access-Statistics:\n");
2418         len += sprintf(buffer + len, "               Device Scanning Order....: %s\n", (ibm_ansi_order) ? "IBM/ANSI" : "New Industry Standard");
2419 #ifdef CONFIG_SCSI_MULTI_LUN
2420         len += sprintf(buffer + len, "               Multiple LUN probing.....: Yes\n");
2421 #else
2422         len += sprintf(buffer + len, "               Multiple LUN probing.....: No\n");
2423 #endif
2424         len += sprintf(buffer + len, "               This Hostnumber..........: %d\n", shpnt->host_no);
2425         len += sprintf(buffer + len, "               Base I/O-Port............: 0x%x\n", (unsigned int) (IM_CMD_REG(host_index)));
2426         len += sprintf(buffer + len, "               (Shared) IRQ.............: %d\n", IM_IRQ);
2427         len += sprintf(buffer + len, "               Total Interrupts.........: %d\n", IBM_DS(host_index).total_interrupts);
2428         len += sprintf(buffer + len, "               Total SCSI Accesses......: %d\n", IBM_DS(host_index).total_accesses);
2429         len += sprintf(buffer + len, "               Total short SCBs.........: %d\n", IBM_DS(host_index).scbs);
2430         len += sprintf(buffer + len, "               Total long SCBs..........: %d\n", IBM_DS(host_index).long_scbs);
2431         len += sprintf(buffer + len, "                 Total SCSI READ/WRITE..: %d\n", ldn_access_total_read_write(host_index));
2432         len += sprintf(buffer + len, "                 Total SCSI Inquiries...: %d\n", ldn_access_total_inquiry(host_index));
2433         len += sprintf(buffer + len, "                 Total SCSI Modeselects.: %d\n", ldn_access_total_modeselect(host_index));
2434         len += sprintf(buffer + len, "                 Total SCSI other cmds..: %d\n", IBM_DS(host_index).total_accesses - ldn_access_total_read_write(host_index)
2435                        - ldn_access_total_modeselect(host_index)
2436                        - ldn_access_total_inquiry(host_index));
2437         len += sprintf(buffer + len, "               Total SCSI command fails.: %d\n\n", IBM_DS(host_index).total_errors);
2438         len += sprintf(buffer + len, " Logical-Device-Number (LDN) Access-Statistics:\n");
2439         len += sprintf(buffer + len, "         LDN | Accesses [%%] |   READ    |   WRITE   | ASSIGNMENTS\n");
2440         len += sprintf(buffer + len, "        -----|--------------|-----------|-----------|--------------\n");
2441         for (i = 0; i <= MAX_LOG_DEV; i++)
2442                 len += sprintf(buffer + len, "         %2X  |    %3d       |  %8d |  %8d | %8d\n", i, ldn_access_load(host_index, i), IBM_DS(host_index).ldn_read_access[i], IBM_DS(host_index).ldn_write_access[i], IBM_DS(host_index).ldn_assignments[i]);
2443         len += sprintf(buffer + len, "        -----------------------------------------------------------\n\n");
2444         len += sprintf(buffer + len, " Dynamical-LDN-Assignment-Statistics:\n");
2445         len += sprintf(buffer + len, "               Number of physical SCSI-devices..: %d (+ Adapter)\n", IBM_DS(host_index).total_scsi_devices);
2446         len += sprintf(buffer + len, "               Dynamical Assignment necessary...: %s\n", IBM_DS(host_index).dyn_flag ? "Yes" : "No ");
2447         len += sprintf(buffer + len, "               Next LDN to be assigned..........: 0x%x\n", next_ldn(host_index));
2448         len += sprintf(buffer + len, "               Dynamical assignments done yet...: %d\n", IBM_DS(host_index).dynamical_assignments);
2449         len += sprintf(buffer + len, "\n Current SCSI-Device-Mapping:\n");
2450         len += sprintf(buffer + len, "        Physical SCSI-Device Map               Logical SCSI-Device Map\n");
2451         len += sprintf(buffer + len, "    ID\\LUN  0  1  2  3  4  5  6  7       ID\\LUN  0  1  2  3  4  5  6  7\n");
2452         for (id = 0; id < max_pun; id++) {
2453                 len += sprintf(buffer + len, "    %2d     ", id);
2454                 for (lun = 0; lun < 8; lun++)
2455                         len += sprintf(buffer + len, "%2s ", ti_p(get_scsi(host_index)[id][lun]));
2456                 len += sprintf(buffer + len, "      %2d     ", id);
2457                 for (lun = 0; lun < 8; lun++)
2458                         len += sprintf(buffer + len, "%2s ", ti_l(get_ldn(host_index)[id][lun]));
2459                 len += sprintf(buffer + len, "\n");
2460         }
2461
2462         len += sprintf(buffer + len, "(A = IBM-Subsystem, D = Harddisk, T = Tapedrive, P = Processor, W = WORM,\n");
2463         len += sprintf(buffer + len, " R = CD-ROM, S = Scanner, M = MO-Drive, C = Medium-Changer, + = unprovided LUN,\n");
2464         len += sprintf(buffer + len, " - = nothing found, nothing assigned or unprobed LUN)\n\n");
2465
2466         *start = buffer + offset;
2467         len -= offset;
2468         if (len > length)
2469                 len = length;
2470         spin_unlock_irqrestore(shpnt->host_lock, flags);
2471         return len;
2472 }
2473
2474 static int option_setup(char *str)
2475 {
2476         int ints[IM_MAX_HOSTS];
2477         char *cur = str;
2478         int i = 1;
2479
2480         while (cur && isdigit(*cur) && i <= IM_MAX_HOSTS) {
2481                 ints[i++] = simple_strtoul(cur, NULL, 0);
2482                 if ((cur = strchr(cur, ',')) != NULL)
2483                         cur++;
2484         }
2485         ints[0] = i - 1;
2486         internal_ibmmca_scsi_setup(cur, ints);
2487         return 1;
2488 }
2489
2490 __setup("ibmmcascsi=", option_setup);
2491
2492 static struct scsi_host_template driver_template = {
2493           .proc_name      = "ibmmca",
2494           .proc_info      = ibmmca_proc_info,
2495           .name           = "IBM SCSI-Subsystem",
2496           .detect         = ibmmca_detect,
2497           .release        = ibmmca_release,
2498           .queuecommand   = ibmmca_queuecommand,
2499           .eh_abort_handler = ibmmca_abort,
2500           .eh_host_reset_handler = ibmmca_host_reset,
2501           .bios_param     = ibmmca_biosparam,
2502           .can_queue      = 16,
2503           .this_id        = 7,
2504           .sg_tablesize   = 16,
2505           .cmd_per_lun    = 1,
2506           .use_clustering = ENABLE_CLUSTERING,
2507 };
2508 #include "scsi_module.c"